Greetings --
Normally, and assuming either a retail license or a generic
(non-branded) OEM license, unless the new motherboard is virtually
identical to the old one (same chipset, same IDE controllers, same
BIOS version, etc.), you'll need to perform a repair (a.k.a. in-place
upgrade) installation, at the very least:
How to Perform an In-Place Upgrade of Windows XP
http://support.microsoft.com/directory/article.asp?ID=KB;EN-US;Q315341
As always when undertaking such a significant change, back up any
important data before starting.
Bruce Chambers
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