I have the same problem, game freezes on exit. Under 1.3 it locked up, couldn't be terminated via task-manager, reboot was necessary. Under 1.4 it still freezes, can be terminated via task-manager, but after some minutes u can see the bsod (blue screen of death) for a splitsecond and the computer reboots.
This is under W2k, OFP is the only programm i know that manages to completly crash W2k in a really violent way .
System:
W2k
GeForce 1 DDR
Soundblaster live value