Windows 10: I need to find my Win10 product key on my old laptop. where can I locate it?

My old laptop will not support Win11 due to hardware incompatibility. I purchased a New Win11 laptop and want to be able to setup "Dual Boot" and retain the Win10 as I have it set up.I have succeeded but cannot activate Win10 without my product key. Due to not being able to activate, I cannot restore WIN10 From my Back ups. My old laptop is 13 years old and originally came with win Vista.through the years I have upgraded through win7, Win8 and finally Win10 pro. All on the same HP Pavillion DV7, but the DV7 hardware will not support Win11, thus I purchased a Win11 laptop. I have also considere

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Need some help. Old HDD. New laptop.

Yes, that would be a favorable solution if possible. But it requires what I said as a first step. Once he gets booted into the OS, then he can either use it as is or try to recover the product key. I'm not saying he couldn't do what you said, I was replying to another post that suggested simply copy/pasting documents from the old hard drive.

 

Need product key for Win10 re-load

• Hi, I had to do a factory reset on my Toshiba laptop (multiple problems, black screening, etc.). I downloaded Win10 from MS site and have loaded it back on but product key required. I have no product key because the previous install was free upgrade from
  Win7 a few years ago.

 

Product Key from old laptop

So it seems my new laptops windows isn't genuine. I thought about buying a new copy of windows but then remembered I have this old laptop with its product key still available (but the laptop is demolished), cant I use the product key of the old laptop
to activate windows on my new laptop?