Reinstall Windows 10 after downgrade to Windows 7

[spamme]

Two years ago my company bought new hp laptops with Windows 10 and downgraded them to Windows 7 because whatever stupid reason. Now they replaced the downgraded WIndows 7 hp laptops with new Windows 10 hp laptops and offered us (employee) to buy the old downgraded laptops for personal use.

Would it be possible to reinstall Windows 10 with the original product key?

Because on the back of the laptop there is only a sticker with written "windows 10 pro" but any product key. In the forum is suggested to use a product keys finder application, I tried a few of them, but they find only the Windows 7 product key and none Windows 10 product key.

[Paul_Tikkanen · Accepted solution]

Hi:

The W10 product key is in the BIOS, so all you need to do is to use the W10 Media Creation Tool at the link below to clean install W10.

https://www.microsoft.com/en-us/software-download/windows10

The tool will allow you to make a bootable USB installation flash drive, or save an ISO file which you can later burn to a DVD using your DVD burning program's burn ISO file option.

The software will automatically work with the W10 Pro product key in your notebook's BIOS.

Then after W10 has finished installing, go to your notebook's support page to install the drivers and available software you need.

I have zipped up and attached a free utility below, that should show you the W10 key in the BIOS.

You do not need to enter the key when you install W10.