An OEM will be able to be reinstalled on the ORIGINAL machine it was installed on ONLY... no
other, it locks to the motherboard...
All the best Brett
Technically all versions of Windows do that. You just get more activations with the keys before Microsoft's activation server starts denying you.
You can actually get the OEM license moved to another motherboard if you call Microsoft and have a good reason. Having upgraded is not
considered a good reason, and Microsoft would like you to buy a new copy of Windows as, by their definition, it is a new computer. If you call them up and tell them that your old motherboard died, however, they'll happily let you reactivate.