u got the game running in the background or wot? i had this prob once with a music cd but a simple reboot got my disc back. i asume you are using windoz and not linux or mac? if you are disconect from the net run a av scan a spyware scan and see if anything comes up as a start. also check for errors if you have got norton utils or systemworks. if not download ccleaner as that has a very basic scanner in it.