I am runnig Evga Geforce 7900 GT KO on an ASRock Dual939 Sata2 motherboard, 4GB, 4200+ 939 CPU. I loaded the 64 bit version of Widows 7 (build 7000). When I open new windows in IE or in applications, My screen appears to loose horizontal sync and turns into 20-30 horizontal lines that slant upward from left to right. I also hear the cooling fan on the video card spin up to high speed. This will last about 45 seconds and then the display corrects and the video cooling fan slows down to a normal speed. Also, when I shut down Windows 7 I hear the video cooling fan cycle fromnormal to fast speed 10 times after I see a black screen. After all of that then the computer shuts down or reboots depending upon the shutdown request. All the nvidia driver updates have been performed as suggested by Windows Update.