Thanks for the advice. Yes. I've tried all the suggested methods but no success. What happens is the system restore window appears and a new restore point can be chosen but the activity doesn't take place. Task manager indicates system restore not responding. I suspect it is a corrupted file because this activity was lost in a PC crash - PC never restarted after system restore carried out. I'm just wondering what would be the appropriate file to possibly replace in my OS WIN XP Media or is there alternative repair S/W?
BJ