Now I tried to do a System Restore, but it won't allow me to do so.
System Restore was already tried.
A repair install isnt hard.
Insert the XP CD. Boot from it. Select install at the first menu. It will go thru. From there you will hit F8 to accept the EULA. There it will scan you system for other Windows installs. The next menu hit R. That is for the repair console.
Not really that hard...