Load Game Crashes

[Tomlo]

Im getting crashes when loading saves giving me this message: "DataIO operation System Error: CITY". It seems to be not always happen but after it does to one save all the related saves die also, for example after the game I was playing all today got corrupted, all of the autosaves did, and other manual saves of the same game.

Im running windows xp pro SP2, Socket AM2 Setup...

Any suggestions?