black screen after boot

Hi, i'm using 32 bit version of windows 7 and i have a serious problem. When i shut down or restart my notebook and "force shutdown" screen appears, windows load with black screen. There is only cursor. I can type password and get to the system and i hear the sound of qip, skype etc. System works but without screen. When i press F8 after BIOS check and choose You last known good configuration (advanced), system loads ok, but without some settings such as a connection to internet or qip has some troubles. I had this trouble on 64bit version too. I think there is some colision with driver and win7. Can you help me pls? This is much better than Vista :)
MY notebook is Acer Aspire 5530G. Amd Turion X2, 2GB RAM, Ati HD3470X2 hybri, win 7 beta 1 build 7000
edit: i tried to install oficial acer graphic drivers, then modified catalyst 8.12 and then ati dna drivers but its same so i think graphic drivers are ok.

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