Minecraft Forums

here is the output I get from launcher log:

[21:25:54 INFO]: Minecraft Launcher 1.6.11 (through bootstrap 100) started on windows...
[21:25:54 INFO]: Current time is May 28, 2015 9:25:54 PM
[21:25:54 INFO]: System.getProperty('os.name') == 'Windows 7'
[21:25:54 INFO]: System.getProperty('os.version') == '6.1'
[21:25:54 INFO]: System.getProperty('os.arch') == 'x86'
[21:25:54 INFO]: System.getProperty('java.version') == '1.8.0_25'
[21:25:54 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[21:25:54 INFO]: System.getProperty('sun.arch.data.model') == '32'
[21:25:54 INFO]: proxy == DIRECT
[21:25:55 INFO]: JFX is already initialized
[21:25:58 INFO]: Refreshing local version list...
[21:25:59 INFO]: Refreshing remote version list...
[21:26:08 INFO]: Refresh complete.
[21:26:10 INFO]: Loaded 2 profile(s); selected 'HouseTelvanni'
[21:26:10 INFO]: Refreshing auth...
[21:26:10 INFO]: Logging in with access token
[21:26:22 INFO]: Getting syncinfo for selected version
[21:26:22 INFO]: Queueing library & version downloads
[21:26:22 INFO]: Download job 'Version & Libraries' started (16 threads, 34 files)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\platform\3.4.0\platform-3.4.0.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.7.19\realms-1.7.19.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.21\authlib-1.5.21.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput-platform\2.0.5\jinput-platform-2.0.5-natives-windows.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.3.2\commons-lang3-3.3.2.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl-platform\2.9.4-nightly-20150209\lwjgl-platform-2.9.4-nightly-20150209-natives-windows.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch-external-platform\4.5\twitch-external-platform-4.5-natives-windows-32.jar for job 'Version & Libraries'... (try 0)
[21:26:22 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Download job 'Resources' skipped as there are no files to download
[21:26:28 INFO]: Job 'Resources' finished successfully (took 0:00:00.000)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch-external-platform\4.5\twitch-external-platform-4.5-natives-windows-32.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\17.0\guava-17.0.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\platform\3.4.0\platform-3.4.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl-platform\2.9.4-nightly-20150209\lwjgl-platform-2.9.4-nightly-20150209-natives-windows.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.7.19\realms-1.7.19.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.3.2\commons-lang3-3.3.2.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\jna\3.4.0\jna-3.4.0.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput-platform\2.0.5\jinput-platform-2.0.5-natives-windows.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.4-nightly-20150209\lwjgl-2.9.4-nightly-20150209.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.4-nightly-20150209\lwjgl_util-2.9.4-nightly-20150209.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch-platform\6.5\twitch-platform-6.5-natives-windows-32.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch\6.5\twitch-6.5.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\oshi-project\oshi-core\1.1\oshi-core-1.1.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.21\authlib-1.5.21.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar for job 'Version & Libraries'... (try 0)
[21:26:28 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:28 INFO]: Attempting to download C:\Users\Nero\AppData\Roaming\.minecraft\versions\1.8.6\1.8.6.jar for job 'Version & Libraries'... (try 0)
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch\6.5\twitch-6.5.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\oshi-project\oshi-core\1.1\oshi-core-1.1.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.4-nightly-20150209\lwjgl_util-2.9.4-nightly-20150209.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch-platform\6.5\twitch-platform-6.5-natives-windows-32.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\jna\3.4.0\jna-3.4.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:29 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.4-nightly-20150209\lwjgl-2.9.4-nightly-20150209.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:30 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\17.0\guava-17.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[21:26:30 INFO]: Finished downloading C:\Users\Nero\AppData\Roaming\.minecraft\versions\1.8.6\1.8.6.jar for job 'Version & Libraries': Used own copy as it matched etag
[21:26:30 INFO]: Job 'Version & Libraries' finished successfully (took 0:00:08.037)
[21:26:30 INFO]: Launching game
[21:26:30 INFO]: Unpacking natives to C:\Users\Nero\AppData\Roaming\.minecraft\versions\1.8.6\1.8.6-natives-11880081510152
[21:26:31 INFO]: Launching in C:\Users\Nero\AppData\Roaming\.minecraft
[21:26:31 INFO]: Half command: C:\Users\Nero\Downloads\runtime\jre-x32\1.8.0_25\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M -Djava.library.path=C:\Users\Nero\AppData\Roaming\.minecraft\versions\1.8.6\1.8.6-natives-11880081510152 -cp C:\Users\Nero\AppData\Roaming\.minecraft\libraries\oshi-project\oshi-core\1.1\oshi-core-1.1.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\jna\3.4.0\jna-3.4.0.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\platform\3.4.0\platform-3.4.0.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\17.0\guava-17.0.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.3.2\commons-lang3-3.3.2.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.21\authlib-1.5.21.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.7.19\realms-1.7.19.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.4-nightly-20150209\lwjgl-2.9.4-nightly-20150209.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.4-nightly-20150209\lwjgl_util-2.9.4-nightly-20150209.jar;C:\Users\Nero\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch\6.5\twitch-6.5.jar;C:\Users\Nero\AppData\Roaming\.minecraft\versions\1.8.6\1.8.6.jar net.minecraft.client.main.Main
[21:26:31 ERROR]: Couldn't launch game
java.io.IOException: Cannot run program "C:\Users\Nero\Downloads\runtime\jre-x32\1.8.0_25\bin\javaw.exe" (in directory "C:\Users\Nero\AppData\Roaming\.minecraft"): CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048) ~[?:1.8.0_25]
at com.mojang.launcher.game.process.direct.DirectGameProcessFactory.startGame(DirectGameProcessFactory.java:14) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.game.MinecraftGameRunner.launchGame(MinecraftGameRunner.java:208) [launcher.jar:1.6.11]
at com.mojang.launcher.game.runner.AbstractGameRunner.onDownloadJobFinished(AbstractGameRunner.java:186) [launcher.jar:1.6.11]
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:122) [launcher.jar:1.6.11]
at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher.jar:1.6.11]
at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher.jar:1.6.11]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_25]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_25]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_25]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_25]
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessImpl.create(Native Method) ~[?:1.8.0_25]
at java.lang.ProcessImpl.<init>(ProcessImpl.java:386) ~[?:1.8.0_25]
at java.lang.ProcessImpl.start(ProcessImpl.java:137) ~[?:1.8.0_25]
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029) ~[?:1.8.0_25]
... 11 more
[21:26:31 INFO]: Deleting C:\Users\Nero\AppData\Roaming\.minecraft\versions\1.8.6\1.8.6-natives-11880081510152

[21:26:31 ERROR]: Couldn't launch game

java.io.IOException: Cannot run program "C:\Users\Nero\Downloads\runtime\jre-x32\1.8.0_25\bin\javaw.exe" (in directory "C:\Users\Nero\AppData\Roaming\.minecraft"): CreateProcess error=2, The system cannot find the file specified at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048) ~[?:1.8.0_25]

Your launcher is configured to run from the Java that it installed the first time you ran the 'new' launcher. This put the Java in the same place you ran it (Downloads), but looks like you cleaned up the download folder after and now that Java is missing. [This could also be a security thing, sometimes you are forbidden from running programs in certain places]

I thought the new launcher managed its own Java updates etc, so I would have though that it might handle this condition automatically, guess not.

In any case to get this to work you need your launcher profile path to Java to be configured to point at an actual Java installation. Whether you have to manually install a java, or uninstall/reinstall the 'new' launcher in a different place so that it can have its private Java installation back again is up to you.

Thanks. How would I go about this?

EDIT: Now that I point it towards a valid Java download, I get this:

[02:05:07] [Client thread/INFO]: Setting user: HouseTelvanni
[02:05:07] [Client thread/INFO]: (Session ID is token:********)
[02:05:13] [Client thread/INFO]: LWJGL Version: 2.9.4
[02:05:14] [Client thread/INFO]: Reloading ResourceManager: Default
[02:05:20] [Sound Library Loader/INFO]: Starting up SoundSystem...
[02:05:20] [Twitch authenticator/ERROR]: Given twitch access token is invalid
[02:05:20] [Thread-6/INFO]: Initializing LWJGL OpenAL
[02:05:20] [Thread-6/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[02:05:20] [Thread-6/INFO]: OpenAL initialized.
[02:05:20] [Sound Library Loader/INFO]: Sound engine started
[02:05:25] [Client thread/INFO]: Created: 512x512 textures-atlas
[02:05:28] [Client thread/WARN]: Failed to load shader: minecraft:shaders/post/entity_outline.json
kc: Invalid shaders/program/sobel.vsh: Couldn't compile vertex program: ERROR: 0:1: '' : Version number not supported by GL2
ERROR: 1 compilation errors. No code generated.
at blt.a(SourceFile:67) ~[1.8.6.jar:?]
at blq.<init>(SourceFile:132) ~[1.8.6.jar:?]
at bls.<init>(SourceFile:29) ~[1.8.6.jar:?]
at blr.a(SourceFile:268) ~[1.8.6.jar:?]
at blr.a(SourceFile:138) ~[1.8.6.jar:?]
at blr.a(SourceFile:86) ~[1.8.6.jar:?]
at blr.<init>(SourceFile:52) ~[1.8.6.jar:?]
at bfr.b(SourceFile:225) [1.8.6.jar:?]
at ave.am(SourceFile:495) [1.8.6.jar:?]
at ave.a(SourceFile:310) [1.8.6.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.6.jar:?]

This error means that your current graphics drivers do not have the required level of Open GL support for the version of MC you are trying to run.

There may be a better / newer driver available (Post a dxdiag).

Or you may be able to run older versions (Select a version in the launcher profile)