Well, I don't know what to say....
I went back to the 45.23 drivers and this is the result (same settings as before):
2003-09-12 22:06:01 - UT2003
Frames: 1243 - Time: 48875ms - Avg: 25.432 - Min: 11 - Max: 89
2003-09-12 22:09:28 - UT2003
Frames: 2566 - Time: 96781ms - Avg: 26.513 - Min: 13 - Max: 61
I don't remember ever seeing framerates drop as low as this before. What could be wrong? The 45.23 drivers are installed...
Coolermaster ATC-210-VX1 case w/ Rosewill 850W PSU | Q9650@3.6Ghz w/ Zalman CNPS9700 LED | eVga 780i BIOS P10 w/ 4GB OCZ Platinum PC8500 | 3-WD 640GB + External WD 1TB + Lite On 12x Blu-ray Burner | eVga Geforce GTX470 SC w/ Sony 60EX700 HDTV | Nvidia HD Audio on Denon 1909 5.1 and Polk Speakers | Dual Booting XP Professional SP3 and Windows 7 Enterprise X64