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#1680
Go ahead and follow the steps at the link below, and post back with your MGADiag report. It'll let us know is you are currently activated with a COA or SLP key.
Windows Genuine and Activation Issue Posting Instructions
If it's a COA key, then you could use any of the other options in the tutorial below to get your key number to use to activate with.
Product Key Number for Windows 7 - Find and See