HP pc re - install Windows XP Product key invalid

I bought the HP Compaq DC 7900 Convertible Minitowers PC 3 years with downgrade to Windows XP (preinstalled at shipment).

Recently, I have problem with my PC and re-formated the pc.  When I tried to re - install Windows XP using the disk provided by the HP (delivered with the purchased PC), it shows that the product key is not valid.  According to my tech sticker pasted on my pc product key was the product key for Windows Vista sticker.
What should I do and how can I get the product key for Windows XP?  I contact center HP support several times and has been said to restore Windows XP using the recovery CD more and yet always fail.  And finally, they ask me is to contact Microsoft.
What am I, I guess what to do?  I need to re - install my pc to Windows XP, as some of my programs are not compatible with Windows Vista.
Thank you.
K.S.Soon

Hello

In addition to the suggestion of Carey Frisch,

If you cannot establish an online connection by using your modem or an Internet connection, the wizard prompts you to contact a customer service representative to activate your copy of Windows XP by telephone.

For more information about activating Windows XP, click on the numbers below to see the steps in the Microsoft Knowledge Base:

How to activate Windows XP

http://support.Microsoft.com/kb/307890

Tags: Windows

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