Sorry to hear that. We don't officially support XP but it has run on it before. Any error messages you can provide? If you send us your sessionlog.log file in Documents/My games/Roadclub we could also take a look at that to see what's going on. Please e-mail us any error messages you get and the log-file above at firstname.lastname@example.org if you'd like to help us fix the problem. Thank you!