http://support.microsoft.com/default...b;EN-US;883254
You receive a "The product key used to install Microsoft Windows may not be valid"
error message when you try to install Windows XP Service Pack 2
http://www.microsoft.com/resources/h...w/default.mspx
Use the Windows Validation Assistant
"jeva" <> wrote in message
news:7776830D-616A-4C3F-BD53-...
> When I try to install service pack, I get message that it can not be
> installed because I may not have a valid product key. I do have a valid key,
> how to solve this problem?