Graphic problem with OSX Lion - freezing all windows

I try to define my graphic problem with OSX Lion. Simply if you have set for example hot cornes and switch between desktop, all windows etc. the move of switchng windows i chopping and freezing. I dont idea why, but it hapennig since I installed Windows 7 via bootcamp. But the problem is still here after I remove Windows. Cleaning cash doesnt work. Can anybody help me please?

No, it's not Lion. It may be something you installed. If you just bought it you could also take it back to the Apple Store and they may be able to help.

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