Guys, i have the same problem - my system:

AMD 955 BE
Vista 64 up 2 date
ATI 6950
i tried 3 different versions of gui miner and tried to connect to a pool, always the cant connect error.
And GUI miner doesnt find my ati, only cayman and my cpu.
I already loaded the latest ATI driver, and that ati stream was also included...


I dont know what to do...