Windows 10: Bought a genuine refurbished HP desktop with Windows 10 installed - however product Key is...

telling me I do not have a valid windows

:)

 

Windows 7 Professional Refurbished

Came across a Windows 7 key that says it is for a refurbished PC. I believe it is genuine. Can I use it on a fresh install?

 

Bought a refurbished hp desktop windows 10

No, you won't lose Windows 10.

You can also perform a custom install:

Go to a working computer, download, create a bootable copy, then perform a clean install.

Step 1: How to download official Windows 10 ISO files

http://answers.microsoft.com/en-us/windows/wiki...

Step 2: If there are files on the drive you want to recover, see - How to: Perform a Custom install of Windows 10

http://answers.microsoft.com/en-us/insider/wiki...

When you upgraded from a previous version of Windows or receive a new computer preinstalled with Windows 10, what happened is the hardware (your PC) will get a digital entitlement, where a unique signature of the computer will be stored on Microsoft Activation
Servers. The Windows 7 or Windows 8 genuine license you were previously running will be exchanged for a diagnostics key.

Anytime you need to reinstall Windows 10 on that machine, just proceed to reinstall Windows 10. It will automatically reactivate. You will prompted to enter a product key a couple times through the installation, click I don't have a key and Do this later.

There is no need to know or get a new key, but if you have issues with Digital Licensing or the Activation Troubleshooter, you can utilize an existing Windows 7 or Windows 8/8.1 product key you already own to reactivate if necessary. or use the reset function
in Windows 10.

 

Installing Windows 10 using Windows 7 key

Nope, you need to install Windows 10 first and make sure the Windows 7 key is transferred to your Windows account after you've installed Windows 10 (not quite sure how that works). I missed the last step and I could not activate Windows 10 after a re-install... Microsoft seem to have done everything they can to make it a PITA. Also, it's technically too late to do this now anyhow, as the upgrade offer has expired. But KMSPico works quite well...

As for getting rid of Windows, delete the Windows folder.