Hello, yesterday i formated my harddrive, and i redownloaded minecraft now. But when i try to start it, i get this error: Could not find the main class: net.minecraft.Launcherframe. Program will exit.

I get the same error when i run it as administrator too (Also run as Win vista/XP)
If somone got this error or know how to fix it, please leave a message on this topic.

PS: I got my java updated to the newest version

Files: 

Minecraft-ERROR.png