After installing Windows 8 Enterprise edition, I received the following error:
Windows can’t activate right now. Please try again later.
Trying later results in the same message. The problem turns out to be that the system need a product key. To do this, simply run an elevated command prompt and type:
slmgr.vbs –ipk “ENTER PRODUCT KEY”
Once this is done, you will be able to activate Windows (and on mine, it was already activated when I went to the activation center).