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You did not mention what file(s) it was looking for-- I found that via Google.
Another thing I saw was -- if the XP home install was an upgrade from an older OS you can get this odd behavior.
It is a strange one... I'll keep looking for answers.

This may help:
You are prompted to insert a Windows XP SP2 CD when you try to run the System File Checker tool on a Windows XP SP2-based computer

You may be prompted to insert a Windows XP Professional CD when you run the System File Checker tool in Windows XP Home Edition

EDIT:Information only:Description of the Windows File Protection feature

Thanks Jelly Bean - well found. Who'd have thought??

Just to confirm that Jelly Bean's fix worked.

Thank you very much.

Hello,hey glad it worked,thats brilliant.Will mark as fixed.