Yes, see here: Microsoft's Windows XP Professional Repair Install step by stepis it possible to reinstall windows xp on the existing hard drive without delete my files?
basically like over writing it
I thought you had already tried thatbut the problem is that when i try to enter my files in dos i get "access is denied" =S
Edit:
You cannot run System Restore from the Recovery Console, but can be run via Safe Mode with Command Prompt C:\Windows\system32\restore\rstrui.exe