User Account problem on XP

Well, today my computer fuxxed up for god knows why, and it told me my system folder was gone or corrupted. It couldn't be repaired, and I didn't want to reformat and lose all the shit I have. I instead installed over the windows that was previously installed, and it worked fine. The only problem I have is I can't access the old user accounts, so I lose my shortcuts, my program list, favorites, and a bunch of other small stuff. It's nothing serious, just a bunch of annoying stuff to lose. If you know a fix for it, please tell me.

Thanks in advance.