There may be occasions where you encounter save or loading errors, if you have - and we'll assume that's the case, since you're here - please accept our apologies.
The first thing to check is your antivirus software. It may be that it's stopping the game saving or launching. It may also be down to file corruption of some kind.
If you still can't get the game to save/load, try restarting your PC, and check that there is enough space on the hard drive.
If it continues to be a problem then we will need to get our highly trained Computer Doctors (yes, that's the technical term) to look into it for you. Please send over your saves/logs and we will jump on it as soon as possible.