OS: WIn 7 64bit
ATI vid card
Verbatim V2 rapier mouse, optical.

Lately experiencing this annoying error with mouse pointer. The pointer would lag for a second or two and skip to somewhere else. After checking found a link that said this could be due to catalyst 11.5 driver; the hotfix 11.5b claimed to have addressed this issue. So, I used that.

Suddenly again - experiencing that in WITCHER 2 gameplay; a sudden lag and then the most irritating of all - screen spinning. The screen starts to spin all of a sudden around Geralt! Then I have to exit manually and restart the whole machine!