Reinstall the operating system without making any upgrades from the internet for security upgrade reasons. Those "security"issues are to secure Microsoft FROM you. I noticed after making THAT mistake that my CD stopped reading all of my own CDs on which I stroed my works and libraries. Getting rid of the new security patches restored my system perfectly.
Good luck.
Cheers.
??? I don't understand, what does the OS has to do with it?
Uninstall DD, mate, you'll be asked if you want to keep the saves. Choose "yes" and reinstall the game after. Patch and play without the NoCD patch. G'luck.