Two methods.
Do you have an XP CD?
If so, place it in your CD ROM drive and follow the instructions below:
- Click on Start > Run and type sfc /scannow then press Enter (note the space between scf and /scannow)
- Let this run undisturbed until the window with the blue progress bar goes away
SFC - Which stands for
System
File
Checker, retrieves the correct version of the file from %Systemroot%\System32\Dllcache or the Windows installation source files, and then replaces the incorrect file.
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http://www.michaelstevenstech.com/XPrepairinstall.htmNote: A Repair Install will replace the system files with the files on the XP CD used for the Repair Install. It will leave your applications and settings intact, but Windows updates will need to be reapplied.
A Repair Install will replace files altered by adware and malware, but will not fix an adware, malware problem.