Step By Step:
Boot the machine from the Windows XP CD
When it loads it will say press R to repair a faulty system, Ignore this and press enter to install a new copy
Setup will now search for existing installations of windows.
Windows will locate the existing installation and ask whether you want to repair it.
Choose yes and sit back.
Windows will now replace all the windows system files whilst leaving the other programs and info on the drive.
He will need his Product Key as this is asked for during the repair.
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