How Ivalidate a re-installation of XP?

I had to reinstall XP on my PC due to an accident.  This is an OEM PC, which was downgraded by the dealer from Vista to XP Pro and I don't have an XP CD.  I tried code COA on the PC but that did not work.  What can I do else?

Suggestions remaining only I have are to install an operating system for which you have a corresponding product key - or - Microsoft telephone support then open a support ticket with them. Installation questions usually get free support - or - contact the original dealear who installed and assistance on their part.

Tom Ferguson

Tags: Windows

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