I have a USB Windows 10 bought from Best Buy on my PC, can't find product key. How do I locate it?

[Windows 10]

My computer has been BSOD IRQL NOT LESS OR EQUAL almost every day.I've been trying to explore options, such as upgrading to Windows 11, but I can't find my product key.No, I don't have a confirmation email.Yes, I have all windows updates installed.

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