I need help. I recently bought Windows XP upgrade. My system meets the specs on the box (AMD Duron 1.6ghz,512mb ram,Nvidia 5500 agp card). When I go to do the upgrade, the upgrade advisor tells me there is an incompatility between my video card and my mainboard. Now my system is custom built running windows 98 with no problems. A little history, I used to have an old SiS 300 series video card until I got the nvidia a few months ago. I am pretty sure that I removed all the files and reg entries from my system. I spent 2 hrs on the phone with microsoft tech support and they have no idea whats going on. Has anyone encountered this before?