I installed Windows Xp Professional around 5 months ago. Since then i havent tried any 3D graphics game until now. The computer keeps on hangin exactly 1min45sec to 2 min after the game starts. This happens in Vice City and in low end graphic games like Counter Strike !!! I am positive it is not my graphic card coz when i had Windows 98, the games were fine. I am using the same driver i used when i had Windows 98. I even updated the driver but still the same problem so i reverted back to the old one. Not sure if this has anythin to do with it, but Norton Antivirus crashes at i386....Pls help!!!

System info:
Pentium 4 @ 2.4 ghz
Windows XP Professional

(i had service pack 1, but when the problem started i unistalled it,but it didnt help)