Windows 7 on the startup disk

I downloaded Windows disk boot provided with my PC and it worked fine for about 18 months. Now after wiping my PC and re - install the boot disk, I need a product key for continue to use Windows. I did not and am sure I have never. Can someone help me?

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You can identify the edition on COA sticker on your machine, at the top/side or bottom compartment or battery (laptop) if it's a desktop computer.

COA certificate of authenticity:

http://www.Microsoft.com/howtotell/content.aspx?PG=COA

What is the certificate of authenticity for Windows?

http://Windows.Microsoft.com/en-us/Windows7/what-is-the-Windows-certificate-of-authenticity

Tags: Windows

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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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