how to find out the microsoft product key from Command Prompt in troubleshooting from usb boot Windows 10

[zahra__]

My laptop is a dell inspiron 3501, I want to reinstall Windows 10 because of the blue screen, but can't Startup Repair and System Restore, for the command prompt it says X:\Sources, and when bootrec/rebuildbcd total identified windows installations: 0, that's why I want completely reinstall howeverthe product key is missing, can you still see the product key from the command prompt?please help, thank you

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