My recommendation would be that you bite the bullet and get yourself a proper copy of Vista or XP, and start again/reinstall from there. You can pick up a legitimate version of XP for £25 or less. Hopefully, your attempts at restoring by other means haven't totally messed your PC up.
But: before you do that... Make sure that you can still obtain the drivers for your PB machine. Given its age, that may be a problem. Check on the PB website.