BTW,.. did you run a XP compatibility check before upgrading? That might tell ya whether or not your card is compatible with XP. Have you tried a different video card in your system to just so you know for sure to start troubleshooting with the video card? Also,... just a thought, but could you possibly have a bad or loose video cable causing the blurriness? Probably not, but it sounds like the problem is intermittent, so I'm just trying to cover all bases. Anyway, this post is probably not much help, but the if the MS compatibility check says it works, then it most certainly should.