Windows 10: 25 digit Windows 10 Product key

I just want the Key in case of problems later. I bought an HP computer in 2018 with Windows 10 already installed. Where do I go to record the Key?

:)

 

25 digit Product Key

Where do I find the 25 digit product key for Microsoft windows 10 for my new hp 250 G6 so that I can activate Microsoft word?

When I bought the computer windows 10 was already pre installed.

Please treat matter with urgency.

 

25 digit Product Key problems

I purchased a refurbished PC 3 months ago. It came with a 25 digit Product Key that used to activate my operating system. All went well until about a week ago when I had the opportunity to purchase a new Laptop. I found a buyer for my Desk PC but wanted
to wipe all my personal info and data from the computer. I was told by the company that I purchased the PC from that I needed to do a factory reset, and they walked me through the process. All was fine except two days later I started getting a message saying
my Windows was not a genuine copy. I entered the same 25 digit Product Key that worked the first time but now it will not accept the Product Key. What should I do?

 

How to find Windows 10 25 Digit Product/Activation Key

I purchase new computer with Windows 10. No paperwork came with it that includes the Windows Product Key (25 digit) for activation. Computer is running OK now, but how do I find this key/code within my computer in case I need it for future? Thank you.