Turning (back) XP Pro to XP Home and Validate Genuine
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Some, who upgraded their XP Home into an "illegal" Pro wish
to downgrade back to Home, because of the WGA annoyance.
But they don't want to loose the complete installation and
start all over again from scratch. THIS can be done!
You need two Upgrade-able Install XP CD's, a Pro and Home.
So, Corporate and Retail versions will do. Or maybe you
used a streamer or patcher and program's like Magic-Iso,
and manifactured your own "Retail" versions XP Pro/Home.
Install XP Home over XP Pro
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Just start an upgrade with the XP Pro CD, and immediately
replace the CD with that of XP Home. First you give the
KeyCode for the Pro and later that of the Home version.
Windows Genuine Advantage (validation)
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If the installation is ready. You need to Activate and
Validate with a Genuine Product Key for that Computer.
Downloading the KeyUpdateTool from Microsoft will fix this.
http://www.microsoft.com/genuine/selfhelp/pkuinstructions.aspx
Tick the "understand line" and use the download button.
Sometimes first deleting the WGA map will be necessary:
%SystemRoot%\Documents and Settings\All Users\Application Data
Delete the map "Windows Genuine Advantage", and only that one.
If validation fails and you have a Genuine ProductCode,
than Call Microsoft free, and they will help you out.
Search (MS, P2P or TheNet) for: MGAdiag.exe
Download MGAdiag.exe and check your Genuine Status.