Greetings --
For most OEM's, it's the motherboard that "defines" the computer,
and they therefore use some form of BIOS-locking to prevent the OEM
license from installing upon a non-OEM motherboard, or to cause it to
subsequently require activation.
Normally, and assuming a retail license (many OEM licenses are
not transferable to a new motherboard), unless the new motherboard is
virtually identical (same chipset, same IDE controllers, same BIOS
version, etc.) to the one on which the WinXP installation was
originally performed, 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.
This will also require re-activation, unless you have a Volume
Licensed version of WinXP Pro installed. If it's been more than 120
days since you last activated that specific Product Key, you'll most
likely be able to activate via the internet without problem. If it's
been less, you might have to make a 5 minute phone call. You
shouldn't have to buy a new license.
Bruce Chambers
--
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You can have peace. Or you can have freedom. Don't ever count on
having both at once. - RAH