How to Run Disk Cleanup on Windows XP Replaced by Unrecognized Versions

1. Insert the Windows XP Setup CD into the CD drive on your computer if you are prompted to. Close the auto run box by clicking the 'X' in the top right corner.
2. Click 'Start,' 'Run' and type 'sfc /scannow' in the open field and click 'OK.' A Windows File Protection dialog box opens with 'Please wait while Windows verifies that all protected Windows files are intact and in their original version' message. This process will take approximately 15 minutes to complete, and automatically repairs any files that are not in their original version. When it is finished, the box will close automatically.
3. Click 'Start,' 'Turn off Computer' and select 'Restart.'