Yesterday my game was working fine with no launch issues. Today I got a new monitor and reinstalled the game. Now it wants a disc to play. I need help fixing that. I don't know what changed. No mods installed.

Edit: Solved. I uninstalled the game. Ran wise registry cleaner as a long shot. It picked up installation issues so I got it to remove them. Reinstalled the game but instead of my game hard drive installed it on my Windows 7 drive. Right clicked and said launch as administrator and the game launched fine with no errors.

Lesson: Don't change from wide screen monitor to LED monitor with this game. The game didn't like it.