Receive an error message that reads: Windows Product Activation.

Windows product activation.  The product key is not valid for this media type.  Please use the CD of instulation correct to reinstall Windows.
Error: 0 x 80040509 is also easy to reinstall the Windows CD? I have lost the previous information I had on my computer?

Hi Harley Girl,

Thanks for posting. This error message occurs if you use a key that is not the same as the CD that you are installing with. Please find the disc that goes with this key, or reinstall using the media that are associated to reinstall. Also if it is OEM you can contact them to get additional support.

I hope this helps!
Shawn - Support Engineer - MCP, MCDST
Microsoft Answers Support Engineer
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Tags: Windows

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