OK, so I've had the Sims 2 game with the University expansion for a few years. Last year I got a new Gateway Laptop with Vista as the OS, and put the game and expansion on it, ran it in compatibility for Windows XP, and it ran fine for a few months (a few problems and conflicts, but nothing that really interfered with how the game worked too much). I got busy and stopped playing for a few months (didn't uninstall, just didn't use it), but last week I decided to play it again. So, I put the University disc 2 in and the DVD drive wouldn't recognize it! The disc was kinda scratched up and worn, so I thought, well, perhaps that's the issue. I cleaned it, and no luck. So, I bought a new Uni disc and it won't recognize this one either. I don't think it's the DVD drive; it recognizes the Sims 2 discs, and it recognizes everything else I put in it. But, unfortunately, you need to have the expansion disc in the drive to run the whole game. I currently don't have my data backed up (I know, stupid), so I hate to uninstall and reinstall if I don't have to. Has anyone had a problem like this? Any advice on how to correct it?