after having Windows 8 installed and configured on my laptop, I found an error when activating it. In the first place had some timeout errors and then it seems that the keys (KMS) server was low or something passed.
As well, in this link I found a tip that allows you to enable Windows 8 by command line, with the following statement (replace XXXXX by the serial of Windows 8)
slmgr.vbs – ipk “XXXXX-XXXXX-XXXXX-XXXXX”
A detail is that you have to launch the console with Administrator privileges. The rest is easy:
Saludos @ La Finca