Have your Windows XP CD ready in the CD Drive then go to
Start | Run | and type sfc /scannow (note the space between w and /)
When that is finished, see if you can create a Restore point.

If you can't,

Again go to Start | run and copy and paste this

rundll32.exe advpack.dll,LaunchINFSection C:\Windows\Inf\sr.inf

into the command line and press OK/enter

If the Files Needed dialog box appears, click Browse and point to the i386 folder on the Windows XP CD (or to the i386 folder on the hard drive, if it exists) for systems updated with the Service Pack 2 CD or Download from Microsoft, browse to the C:\Windows\ServicePackFiles\i386 folder. The retail version of Windows XP (SP2) also contains the latest version of the files needed.


These are the files needed to perform the reinstall:

FILE NAME:
FILELIST.XML
RSTRUI.EXE
SR.SYS
SRCLIENT.DLL
SRDIAG.EXE
SRFRAME.MMF
SRRSTR.DLL
SRSVC.DLL
SRVSVC.DLL


SP2 VERSION #:

5.1.2600.2180
5.1.2600.2180
5.1.2600.2180
5.1.2600.0

5.1.2600.2180
5.1.2600.2180
5.1.2600.2577