@ Mujifighter
That's the SAME problem I've encountered, and now I've the same with NFSU2. Even when I have reinstalled the OS (2 times) I've kept the D:\ partition (which is about 50 GB, 40 of them full & defragmented). Maybe I'll try to free some disk space and just defragment again with that proggy. Thx for the advice.
However my config is:
P4 3.06 Ghz HT FSB533 (I've tried the imagecfg trick, but nothing)
1024 Mb DDR 333
80 Gb Hard Disk @ 4800 RPM
ATI Mobility Radeon 9600 128 Mb (NOT shared)
When I bought it, just 2 years and a half ago, it was really a gaming machine.
Maybe it would be still good if there where some good and up-to-date gfx drivers. I've already tried official ATI catalyst, DNA and Omega Drivers, Unyan Catalyst and DHModtool, but with latest drivers I'm unable to reproduce videos.
Anyway, I'm sure that the problem isn't caused by:
USB joypad
Firewall
Antivirus
Updating features running in background
Internet Connection
Paging File Fragmentation
Dual CPU issues (it could happen while programmin' with feet

)
GFX card (it works perfectly with other heavy games such as COD2)
Hope this will help in finding a solution.