I try to start the game and it gets stuck on the loading screen and I bring up the task manager and it says the game is not responding. This only happens with the single player mode though, multiplayer works fine. Thanks for your help, really frustrating.
When I initially loaded COD, it used to freeze during the startup movie. I had to remove my new and improved NVIDIA driver and load an older version of the driver from a old cd. The game worked great on my TNT2 M64 card after that.
Doesn't sound like driver issue here as its only affecting sp. a driver problem would affect both.
Sounds like your sp pk3 files are corrupted. Either copy them over from the game cds again (if you know how), or alternatively reinstall the game.