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I am running minecraft 1.6.1 unmodded, and I keep getting the same crash every time I have 1000 mb's allocated (1 gb). I am also using the magic launcher. Please help.

*** MagicMinecraftLauncher 1.1.6 ***
LCP: ;C:\Users\Mom\AppData\Roaming\.minecraft\versions\1.6.1\1.6.1.jar;bin/jinput.jar;bin/lwjgl.jar;bin/lwjgl_util.jar
MainClass: net.minecraft.client.Minecraft
java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at magic.launcher.Launcher.main(Unknown Source)

same thing is happening to me with magic launcher.