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Whenever i try to start up forge minecraft for 1.6.4 thru 1.7.2 it just doesn't load up!t even put in the output! heres the output for 1.6.4:May 30, 2015 6:23:35 PM net.minecraft.launchwrapper.LogWrapper log
INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
May 30, 2015 6:23:35 PM net.minecraft.launchwrapper.LogWrapper log
INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
May 30, 2015 6:23:35 PM net.minecraft.launchwrapper.LogWrapper log
INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
2015-05-30 18:23:37 [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
2015-05-30 18:23:37 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) Client VM, version 1.8.0_31, running on Windows Vista:x86:6.0, installed at C:\Program Files\Java\jre1.8.0_31
2015-05-30 18:23:38 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2015-05-30 18:23:38 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
2015-05-30 18:23:38 [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2015-05-30 18:23:38 [SEVERE] [ForgeModLoader] Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
at java.util.ArrayList$Itr.remove(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Heres 1.7.2: [18:25:51] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[18:25:51] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[18:25:51] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[18:25:51] [main/INFO] [FML]: Forge Mod Loader version 7.2.116.1024 for Minecraft 1.7.2 loading
[18:25:51] [main/INFO] [FML]: Java is Java HotSpot(TM) Client VM, version 1.8.0_31, running on Windows Vista:x86:6.0, installed at C:\Program Files\Java\jre1.8.0_31
[18:25:51] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[18:25:51] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[18:25:51] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[18:25:51] [main/ERROR] [LaunchWrapper]: Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_31]
at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_31]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

And thats all! thanks in advance for helping!