After an extensive try of PS I wanted to try some techniques with CC3 and I got the same problem like Laurant with Win 7 64-bit version. Yes, I have the actual patch and the latest drivers. Turning on the effects let me think I am using a 386. I will use CC3 (some message boxes tell me that I am using CC2) on my laptop with a XP installed (and no problems) until this problem is solved.