All,
I seem to have got this running under SP1.
1) Uninstalled and reinstalled, including manually deleting old directory to remove old gameplay settings (not sure if this helped - I just wanted a clean start)
2) Setup the newly installed icon to run in XP compatability.
3) Downloaded the new 3Dsetup for Nascar Thunder - but using the link provided above to just download the file
http://www.mediafire.com/?4ntdnumdknh.
4) renamed old 3Dsetup and replaced with new one.
5) Ran simracing - going through the 3dsetup again when it came up (note, I did change the default 800x600 to the largest (14??x900).
6) Game started and ran fine for 10-15 minutes.
Note - Trying to adjust your Telemetry will lock up the game as mentioned above - This wasn't something I ever used so not sure what it's for - and I will not try it again on my Vista box knowing it locks up.
Otherwise - enjoy. Now when my nephew comes over, we can attempt the racing over the LAN (my other computer is still XP, and simracing still works ok on that box no problem - but now we can have our racing over the LAN again).
DB64