Windows 10: Where can I find my lost product key?

I recentIy upgraded my laptop to windows 11, but after sometime I downgraded to windows 10. When I tried to open my old PowerPoint presentation i needed to change my office product key but when I entered the product key it sayd "Sorry, this isn't a Microsoft Office product key. You may be entering a product key from another version of Office. The key I entered is the one I checked using cmd using : wmic path softwarelicensingservice get OA3xOriginalProductKey comand and PowerShell using : get-wmiobject -query ‘select * from SoftwareLicensingService’.OA3xOriginalProdu

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Lost of Product Key

I bought my Laptop in July 2015 with the Home and Student Microsoft Word. When I refreshed my computer I lost the Product key and I could not find the CD that contain the product key. What shall I do please suggest and help.

 

I lost my product key

We know nothing about your computer, or how you lost your product key.

More information is required to assist you correctly.

I suggest that you read this for suggestions on how to ask a question in help forums:

"Suggestions for asking a question on help forums"

http://support.microsoft.com/kb/555375/en-us

 

Lost Windows Activation Product Key

I recently lost my Windows 10 pro Activation product key and now Microsoft wants me to activate my windows but now i dnt have any product key please suggest me the way i dnt want to lost my all data...