I tried to install forge like 10 times in clean minecraft,i'm sure that theres nothing to stop the forge on .minecraft , and there is the ForgeModLoader-client-0.txt

 

2013-02-12 01:09:51 [iNFO] [ForgeModLoader] Forge Mod Loader version 4.7.32.553 for Minecraft 1.4.7 loading

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] All core mods are successfully located

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Discovering coremods

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Found library file argo-2.25.jar present and correct in lib dir

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Found library file guava-12.0.1.jar present and correct in lib dir

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Found library file asm-all-4.0.jar present and correct in lib dir

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Found library file bcprov-jdk15on-147.jar present and correct in lib dir

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Running coremod plugins

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Running coremod plugin FMLCorePlugin

2013-02-12 01:09:51 [iNFO] [ForgeModLoader] Found valid fingerprint for Minecraft Forge. Certificate fingerprint de4cf8a3f3bc15635810044c39240bf96804ea7d

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Coremod plugin FMLCorePlugin run successfully

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Running coremod plugin FMLForgePlugin

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Coremod plugin FMLForgePlugin run successfully

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Validating minecraft

2013-02-12 01:09:51 [FINEST] [ForgeModLoader] Minecraft validated, launching...

2013-02-12 01:09:52 [iNFO] [sTDERR] Exception in thread "Thread-12" java.lang.RuntimeException: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher

2013-02-12 01:09:52 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:269)

2013-02-12 01:09:52 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:212)

2013-02-12 01:09:52 [iNFO] [sTDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)

2013-02-12 01:09:52 [iNFO] [sTDERR] at net.minecraft.Launcher.replace(Launcher.java:136)

2013-02-12 01:09:52 [iNFO] [sTDERR] at net.minecraft.Launcher$1.run(Launcher.java:79)

2013-02-12 01:09:52 [iNFO] [sTDERR] Caused by: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher

2013-02-12 01:09:52 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:159)

2013-02-12 01:09:52 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:254)

2013-02-12 01:09:52 [iNFO] [sTDERR] ... 4 more

2013-02-12 01:09:52 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: net.minecraft.Launcher

2013-02-12 01:09:52 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source)

2013-02-12 01:09:52 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source)

2013-02-12 01:09:52 [iNFO] [sTDERR] at java.security.AccessController.doPrivileged(Native Method)

2013-02-12 01:09:52 [iNFO] [sTDERR] at java.net.URLClassLoader.findClass(Unknown Source)

2013-02-12 01:09:52 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-02-12 01:09:52 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-02-12 01:09:52 [iNFO] [sTDERR] at java.lang.Class.forName0(Native Method)

2013-02-12 01:09:52 [iNFO] [sTDERR] at java.lang.Class.forName(Unknown Source)

2013-02-12 01:09:52 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:151)

2013-02-12 01:09:52 [iNFO] [sTDERR] ... 5 more

 

I followed installing instructions correctly so , what's wrong?

Are you using mineshafter by any chance?

Yeah