win7 x64
radeon hd770
edit: just sth happened, windows freezes and after a driver crash, miner started working on 200kh

[changing driver and will update post]
edit2: driver updated, miner started to work at 6mh speed for few seconds, and boooooom
windows crashed =)) [ brb

) ]
edit3: seems everything is working f9 now, miner works at 100% but when i feel some decrease in vga performance while im working with autocad (of course when miner is not running :-" ) which might be driver issues :-?
anyway, 6mh more added to my power hash rate

thnx gigawatt

Glad the driver update fixed the problem. I've had Windows freeze once or twice during testing, but a reboot usually fixes it.