Locate your Windows XP installation CD. If you don't have one, you'll need to locate a directory on your system that's named "i386" (without the quotes). This directory may be on a hidden partition on your hard drive.
Go to Start, then to Run, and type in "SFC.EXE /SCANNOW" (without the quotes - and with a space between the SFC.EXE and the /SCANNOW). The press Enter.
The program may or not ask you for your Windows XP installation CD - please insert it at the prompt. If it doesn't ask you for the CD this means that it wasn't necessary to replace any files.
In the event the the system asks you for the CD, you must visit Windows Update immediately after the scan is completed (Please note that there won't be any confirmation dialog - the program will just exit without telling you anything).
If this doesn't repair the problem with your system other troubleshooting procedures are required. We may have to do a repair install of XP
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