Screen flickering in windows

[yegor]

I just built myself a new PC. Ive always been an ATI fan, but now I decided to go with Nvidia. My new setup works great, and Im happy, except for the monitor flickering issue. I have a dual monitor setup. It randomly flickers when Im using the nvidia CP. This isn't so bad, since I dont click on the CP that often, whats more annoying is that the primary monitor (and sometimes secondary) flickers almost every time I left/right click a video file (or select it with a keyboard), OR view an embedded video in a website. Second monitor also flickers when I boot windows.

My hardware:

7900gtx
nForce 680i
QX6700
2gb ram
150GB raptor
2x Samsung SyncMaster 940B

The monitors are fine, because I had 0 problems on my ATI dual screen setup. I tried applying the registry fix, and getting new cables, installing 84.21 drivers as recommended by the "support", all useless.

Any ideas?