in the past I did post the same issue. No luck, so I did go back to XP...
So I thought: why not try again Windows 7?
I did a clean install (formated my C:, installed 7...), installed drivers
... updated some stuff through Windows Update... And for my surprise, the bug was back again, this time started really fast (did use the system for 30min and from that time till now the bug appears and dissapears in the speed of light...)
Last time I guess wasnt clear about what my problem was... And I saw many answers to people with the same kind of issues, which didn't correspond to what the problem really is...
So now I did make a video, showing it. http://www.youtube.com/watch?v=onk6y_55SU8
I'm already using the latest video drivers, and its a clean install. Just did install it.
I can't use Windows 7 with this bug, because even when using ALT + TAB, it appears and dissapears! So I can't change from one window to another.... Just after lots of effort (and luck).
Any advice is appreciate.