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Product Key Invalid During Windows XP Repair Install

I need to know if any solution exists to either cancel a Repair Install or fix why the product key is invalid.

I did a repair install on a Dell machine that had Windows XP Home Edition already installed with SP3.  I loaded a Windows XP Home Edition with SP3 CD in the CD Tray, booted from CD, and did a repair install (NOT using the Recovery Console).

After it went through its process, the Windows XP Home Edition Upgrade wizard appears asking for the product key.  After I entered in the Windows XP Home Edition product key that is on a sticker attached to the computer, a message pops up saying "The CD key you entered is not valid."  I entered the key several times to be sure it wasn't a typo - still no luck.
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I suspect athomsfere is correct wrong copy of Windows Home, you will need an OEM version if you use the key that is on the Dell.
If you don't have original Windows CD which you got with Dell laptop, you have to reinstall Windows using your current CD.
You can also use the recovery partition if your machine has it intact.

It is also possible to create an install disk from the recovery partition
I have cancelled an XP setup once before. Can't remember exactly how though....

I wanna say there is a reg key you would have to change from a 1 to a 0. Key is under hklm/software/microsoft/windows nt/, value is SetupInProgress....I'm going COMPLETELY of memory here though...

I had to figure this out when someone started a repair do rid themselves of a sality infection. Requuires Offline registry editing, via slaving the hdd/bartpe...
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LlewellynIT

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I needed to use the Dell OEM Windows XP Home Edition in order for this to have worked.  I replaced the CD, rebooted, and it completed its process without even asking for the CD key.  Thanks for the article and for everyone's input!
You're welcome - if you found the article useful feel free to click through to it and choose the link that shows it helped you.
Thanks