Oh yar, teh fixors.
Delete the file named radial.cdb in your C:\Documents and settings\all users\application data\Test Drive Unlimited
Folder.
You must enable viewing of system files and hidden files to see it to delete it, and delte it after every game play. There are some tools a hombre has come up with to auto delete this file, as well as backup your profile in the case it becomes corrupted, and also other tweaks. None of which is supported by Atardi. Bunch of twats.
-edit-
Deleted bit about advocating "other means" of acquiring the game.
-/edit-