New HDD in OEM Windows 8 pc

daniel202

Commendable
Mar 28, 2016
8
0
1,510
I'm upgrading pc's very soon. The pc I'm getting is an Asus-cm1745 if I'm not mistaken. I'm getting it for free (For now) and it's better than what I have.
Anyways, The pc has no HDD and I'll be getting a new one with it. It came with Windows 8. I found the drivers on the Asus website so setup should be easy, but I'm wondering... since the Windows 8 OEM pc's contain the original product key within' the bios, will installing Windows 8 without the product key in hand work? More so, would it be possible to install Windows 7 in this situation or better yet, Windows 10? (I think I know the answer on that last part, but I would still like to be informed.)
If I can't get access to the product key I'll just use Windows 7 and use some of the janky loopholes that we all hopefully know, yet hate.

Thanks for the help,