I also got another error 12 the other night. I have my graphics turned down, but to 4, anyway, mine also was an original game file that I had brought back after the patch and the SE 16 problems. Thanks to this site, I was really excited I got it back. So I have been playing this lot and had put quite a few spawners on the lot, (this was after I found out about them), and the game started taking forever to fill in again. This is the large lot in RV across from Jon Lessons house. I got error 12 and lost some, removed the bad file, and got it back, and it really got slow, so I packed them up and moved them out before anything else happened and now, I still have my original family and carls site saved the day again because of the help and information I got here. I do know one thing though, if a person can increase their memory to 4 gigs, it does help tremendously and do regular maitenance on your machine and have a good graphics card, the game runs great. So far, I have not had to uninstall and reinstall either. I do know about the DEP and I think I did have to change that at one time, but it was with another game, but that is another issue people do not know about.