OEM versions of Windows XP do not permit
motherboard upgrades. You need to purchase
a new "Full Version" of Windows XP and
perform a "Repair Install".

How to Perform a Windows XP Repair Install
http://www.michaelstevenstech.com/XPrepairinstall.htm

--
Carey Frisch
Microsoft MVP
Windows - Shell/User
Microsoft Community Newsgroups
news://msnews.microsoft.com/

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"tahoemark" wrote:

| I decided to replace my aging motherboard and processor and now I'm asked to
| activate windows. I follow the activation process and it tells me that my
| product key is invalid or something like that.