Extract Product-Key info from my OEM W7 Laptop!

I got the above OEM built's Windows 7 Home laptop, to which I LOST all the relevant info.,including its Product-Key for re-registration IF I wanted to first update to Windows 10 but falling back to Windows 7 afterwards.
So may I ask HOW to "access" to my Windows 7's Product-Key info from my laptop please??? I have trid my Laptop's Windows 7's System Information but not successful.

Belarc Advisor has always been useful for all sorts of things, especially licence keys.

I have tried your recommended "Belarc Advisor" and it works for me, thank you!!!

P.S: This Browser's based Application gives even more listings of my installed Applications, and it is much more informative and helpful than MS's System Information.

You're welcome. I've used it for many years, indeed I run it every 6 months or so on my 2 PCs, print & file the listings.