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Everytime i try to launch minecraft or any modpacks like FTB and atlauncher they won't launch this is what i get when i start normal minecraft. I have deleted the .minecraft but still nothing.

Log:

Reversing LZMA on C:\Users\iamthebeast54\AppData\Roaming\.minecraft\launcher.pack.lzma to C:\Users\iamthebeast54\AppData\Roaming\.minecraft\launcher.pack
Unpacking C:\Users\iamthebeast54\AppData\Roaming\.minecraft\launcher.pack to C:\Users\iamthebeast54\AppData\Roaming\.minecraft\launcher.jar
FATAL ERROR: java.lang.ExceptionInInitializerError
at com.sun.java.util.jar.pack.TLGlobals.<init>(Unknown Source)
at com.sun.java.util.jar.pack.UnpackerImpl.<init>(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at java.util.jar.Pack200.newInstance(Unknown Source)
at java.util.jar.Pack200.newUnpacker(Unknown Source)
at net.minecraft.bootstrap.Bootstrap.unpack(Bootstrap.java:157)
at net.minecraft.bootstrap.Bootstrap.execute(Bootstrap.java:123)
at net.minecraft.bootstrap.Bootstrap.main(Bootstrap.java:381)
Caused by: java.lang.RuntimeException: java.util.zip.ZipException: invalid LOC header (bad signature)
at com.sun.java.util.jar.pack.PropMap.<clinit>(Unknown Source)
... 12 more
Caused by: java.util.zip.ZipException: invalid LOC header (bad signature)
at java.util.zip.ZipFile.read(Native Method)
at java.util.zip.ZipFile.access$1400(Unknown Source)
at java.util.zip.ZipFile$ZipFileInputStream.read(Unknown Source)
at java.io.FilterInputStream.read(Unknown Source)
at java.io.FilterInputStream.read(Unknown Source)
at java.util.Properties$LineReader.readLine(Unknown Source)
at java.util.Properties.load0(Unknown Source)
at java.util.Properties.load(Unknown Source)
... 13 more

Have you tried to update your Java?

Hi,

Can you give us the entirety of the logs that it gives you?

You also appear to be on Windows, are you using the new native launcher from https://minecraft.net/download (Minecraft.msi)? If not, please try using it.

Thank you i got it to work i had to download the new launcher.