Windows 10: Can Windows 7 be activated by the key that has activated Windows 10?

I use guest Windows 10 in VirtualBox on host Linux. Windows 10 has already been activated by a valid Windows 7 product key. Assuming that I will install guest Windows 7 in the same VirtualBox on the same motherboard, can Windows 7 be activated by the same product key?

:)

 

activate windows 7 oem key

There is no difference between the OEM disc and the Retail disc with Windows 7. A retail disc will accept a OEM or Retail key, and vise versa.

If the OEM Key wasn't going to work with the disc you have, it would have stopped you during the install when it first asked you for the key, not during activation.

What is likely the problem is that, since the OEM version has already been activated once, it is failing activation again. Activate it over the phone using the option given to you on the failed activation screen, and you shouldn't have a problem activating it.

 

Windows 10 Activation (Insider)

I did a full clean install of Windows 10 a while back and it will not activate. I didn't do a clean install from Windows 7/8/8.1 it was from Windows 10 (activated) so I expected it to activate just fine since it was fine before hand.

My Windows 10 license wasn't created from a previous Windows 7/8/8.1 key I got it from signing up to be an insider back in Nov of 2014. I installed a preview build on my laptop from the insider program and it worked just fine and it automatically upgraded to newer and newer preview builds and then to the full release automatically, fully activated and working fine. I did a full clean install not long ago (expect it to go through without issue since it was working before) and now it will not activate and I can't find any info on how to get it to activate and I can't seem to find the insider Windows 10 key.

Microsoft online support was useless and the gave me the toll free number to tech support.. I am currently on the phone waiting, they said it could be a 1hr 30min wait.. sigh.. Any help would be appreciated. Thanks.

 

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.