Hello first time poster here, I got CoD4 from a savers a couple of days ago and I'm getting this problem. The game wasn't installing correctly with the disc cause it was stuck on "updating component registration" so I pasted the disc contents onto my PC. Played the game for a while then closed it and took the disc out. Now today I put the disc back in and I open up the singleplayer program but keeps giving me the error of "Please insert the correct DVD-ROM, select OK and restart application." I've looked everywhere on other forums, I've tried changing the compatibility settings of the exe, tried running as admin but it just doesn't work. Any ideas on why it's not working?