My problem:  I had a virus which I deleted through REGEDIT and rebooted as instructed.  When the system came back up, Windows failed to load properly.  I attempted to restore the "last known good configuration" with no success.  Windows still will not properly and completely load and everything is VERY slow to open when it does open.  What could this be?  How do I fix it (if it's REPAIRABLE).First when ever you use the registry to make changes, always back it up. One way to fix it with the limited information is to use ur insalation disk. And REPAIR windows from that, just make sure you don't REFORMAT it. I THINK the button is "R" for repair. your files will remain in tack while windows gets fixed.I don't have the installation disc, I bougt this PC from someone and they didn't have it.
did u try other restore points, older ones that is in stead of the last know config. If not can u borow a windows xp disk from a friend or family member?
after that consider buying an OS. If u delet keys in the registry, they become LOST and its impossible to restore them by saying u need this and that. Way to many keys to sift through.