Windows 10: Oem key to a normal key

I bought a prebuilt a few years back which I regret but now im changing cases which means im changing the motherboard to which then means my oem key for windows is useless but I was wondering if there was a way to chamge an oem key to a normal key for a fee of some sort instead of buying a whole new key

:)

 

Windows 7 OEM key

Perhaps the OEM key has been used a few times already and cannot be used again.
I have changed motherboards in laptops and the OEM key worked, without having to call Microsoft.

 

activate windows 7 oem key

FWIW, WinXP OEM and Retail disks and keys cannot be interchanged. I suspect it's the same with Win 7.

The good thing is that any OEM key will work with any OEM install, regardless of the branded vendor.

 

activate windows 7 oem key

I guess you can use any oem win7 disk with an oem win7 key.

But you can't use an oem win7 key if you install using a retail version win7 disk.

I stand to be corrected......