Hi,
One can use any activation type key with an installer OEM or full retail make no difference just needs to match the version Pro/ Home...
The activation key defines the windows version.

Again...

Hi,
No I'm saying or guessing really a retail dvd installer can not be used on a uefi only boot bios setting.

Hi,
It's win-7 he'll be fine welcome back from the dark side :thumbsup:

Hi,
Probably set to boot to uefi only
dvd is not going to be able to do that

It's better to remove the existing hdd or ssd and insert a new one so at least the original install is intact
...