Every time i right-click a wmv file or other format, my screen blacks out and returns. It also happens when i delete a moviefile or hit the advanced button in the display-properties. I had this problem even with my old computer with a gt4200 in it. The problem first occured when i installed newer drivers on my 4200. Now i got a 7800gt and cant get rid of the problem. Anyone experienced simular problems? The monitor is a LG Flatron 915ft plus CRT btw.