That's a very small hard drive with not a lot of space left. Have you defragged recently? I'd suggest doing that and running some of the free scans at
PC Pitstop: Free PC Diagnostics, computer help and Tuneups to make sure your PC settings are ideal.
I have to think it might be something with your computer since every type of game is crashing in the same spot. Also, have you run older versions of OOTP without issue? If so, which ones? Thx.