This means that your installed OS is at a higher service pack level
than is the WinXP Pro CD you're using. You'll either need to uninstall
SP2 before attempting the upgrade, or try slipstreaming SP2 into the
upgrade.
For slip-streaming the service pack and subsequent updates to WinXP:
How to integrate software updates into your Windows installation source
files
http://support.microsoft.com/default.aspx?scid=kb;en-us;828930
SlipStreaming WinXP
http://www.webtree.ca/windowsxp/slipstream.htm
--
Bruce Chambers
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for me, give me liberty, or give me death! -Patrick Henry
ThankYou All And May GOD Bless You . Don Ciccio