From hours of research and looking at other people's benches with 8800 GTS's and Ultra's, the best drivers for XP32 and 8800 is either 171.17, 171.23, 171.37, or the quadro driver 169.61. Don't bother with any of those new 174 series drivers for XP and 8800's, their minimum fps blows compared to these 3 drivers. The 171.17 + 171.23 bench basically the same. Haven't been able to compare benches of those ones to the 171.37 so if somebody wants to bench those against each other then you will be able to find the current best 8800 non-quadro driver. As we are all just figuring out now, nvidia has skipped updating the 8 series in order to attempt to make the inferior 9 series look better in reviewer benchmarks. If they had not done this, one of those 171 drivers which all three are already WHQL would be on the nvidia site for download.