Hello. I am having a serious problem with my graphics card, or at least I think so. I am using a Radeon X800XL, and the problem is that I am basically unable to play certain games, like Age of Empires 3. Upon starting, it is a little laggy. After the intro movie, there is a long break before the menu shows up, although the music immeadiately starts playing. So I enter a skirmish, or whatever, and it is pretty good, still a little laggy, but nothing serious. Then, after about 5-10 minutes, the whole screen turns into a grid of squares. After quitting, the squares remain on the desktop and everywhere else, so I have to restart the computer. This has happened in one other game so far, Warcraft 3, however it has not happened in UT 2004 or any 2D games, like Diablo 2. This all started after a virus made me unable to log in at the starting screen for XP, so Microsoft Technical support told me to replace the system files with the fresh ones from the installation CD. After that, the whole computer is always a slower. It takes forever to start, both the computer and applications, and this problem appeared. I currently have Catalyst Drivers 6.3, and have also tried 6.1. Does anyone kno what is causing this or how to fix it?