Activation

[Jeff]

Hello, I have a computer that had Windows XP on it
already and I reformatted. My friend came over with his
Windows XP Home CD to reformat for me. I was unaware
that my Product Key was on the side of my computer. I
tried to activate my computer and it says invalid because
it needs my friend's key to activate, not mine. He is
using it though...what should I do?

 

[Michael Solomon \(MS-MVP Windows Shell/User\)]

I believe this is what you are seeking:

XP In Place Upgrade To Change License Key
http://www.michaelstevenstech.com/xp_in_place_upgrade.htm