Issues installing Windows 8 Enterprise at work

Hi

Our company has access to Windows 8 Enterprise with serial. Today i thought i would install it on my Macbook Air with running parallels but failed.

It comes to the part where i put in the serial number and it just wont take the serial and tells me that i should check the unit (what ever that means??)

I know there are a lot of people with knowledge here, anybody had the same issues? I called the Microsoft support guys today and they told me to comeback at the end of the month when they start supporting Windows 8. I appreciate all help i can get, would be nice to get the Visual Studio up and running on it instead of using Citrix. Thanks guys