I have a Dell dimension 3100 PC. I was playing the sims and then it crashed and closed down, everything on my screen was huge. I shut my comp down and restarted it. It won't start up it just says- Loading PBR for descriptor 2...done. A disk read error occurred press ctrl+alt+del to restart.

I've pressed that like loads of times and it won't start.

Please help. Also I CAN'T lose my stuff so is there anyway it could be fixed without losing all my files?
I have windows xp.