Windows 10: Activation vs. OEM key

I am intending to purchase a new Windows 10 key, since I purchased a new motherboard that was apart of a custom build. What is the exact difference between these two?

:)

 

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.

 

activate windows 7 oem key

Is there any way to activate a oem key in a win 7 wich has not been installed with the oem disk? The key is the one wich came with the computer and I installed version that matchs with it, so there wouldn't be any problem of using any other disk of win 7, but it doesn't activate.

 

oem activation key

I have a window 10 os oem version. I want to do a fresh reinstall on my computer. Can I use the same activation key ( i used in the first place to get my pc up and running) if it has been used before.

Note: I will use the same cd and the key