Upgrade from Windows XP Home to Windows XP Pro

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Lynner

Junior Member
Aug 10, 2005
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Has anyone ever experienced the message: "Invalid PID".
I'm trying to install a Windows XP Professional upgrade on a Compaq Presario 2200 laptop. This is the second Windows XP Pro upgrade that's been purchased. The first did the same thing. Surprise! Compaq & Microsoft are no help.
 
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