Windows

That is System File Checker (SFC) running and replacing changed files with correct versions. SFC is on Win2K and XP (and even Win98, from what I understand). Everytime you boot your system, SFC runs to make sure the OS files are the correct ones. This is in case you get a virus that changes OS system files. SFC will remove the virus-infected ones with backup copies it stores.

Here is a Technet article about SFC:
http://support.microsoft.com/?kbid=222471

hope this helps

Thanks for that answer but it dosn't really answer why this should be occuring after doing all the updates etc.
I would of thought that the correct versions were the ones that had been updated ?

This message is notifed by the Windows File protection feature. And the error indicates that there are still files that are replaced by a different version by some application or a spyware file. Best thing is to Run SFC /CANCEL. This will calcel all the pending SFC Scans and run SFC /SCANNOW for once now and update all the core system files. This will update the dllcache file to the most recent. Once this process is completly over, restart for once and shouldnt be getting any more errors.

I have seen this problem before. Specifically when XP SP1 was in beta. Some 3rd party programs replace certain OS files to allow them to run. When windows sees this, it doesn't recognize the version of the file and wants to replace it. I would ask your client what program(s) he installed before this window started to popup, and you will most likely find your culpret. Hope this helps.

Woody