I've had this doubt a few years ago when I bought the game GTR2. For some odd reason, it must be run with Administrator privileges. I know this is dangerous for other kinds of programs, but since I don't use the Multiplayer, it's not possible for me to be exploited through this Sim (at least not online). However, I still want to run it as a regular user; how can I do that? I gave a brief look at it's properties and the box about "Run as Admin" is already ticked off.