Unity 4 Crash on Startup! (491313)

Hey, i have installed unity 4 and it will crash on when i try to start it. I can see only New project window, when i try to make new or load any project it will crash.

Unity 3.5 works well…

Error Log:
Unity Editor [version: Unity 4.0.0f7_034d3531fec3]
Unity.exe caused an Access Violation (0xc0000005) in module Unity.exe at 0023:00605115.

Also tryed to clean registry with ccleaner…

Please try the options listed in the following:

What version of Unity 4 do you have?