I was warned by a friend about ATI drivers. So I decided to go nVidia especially when using x64. XP is a very stable operating system and most of the problems come from not well tested drivers. Traditionally x32 drivers are well tested, whereas x64 drivers have a much smaller user base and so one must be really careful about the PC components. Best thing is to have a dual boot system. If you experience a similar problem in x32 and x64 than it may be a hardware or application problem, but you never can be sure ;-)