Quickly Activating Windows 8
If you were never asked to activate by your device or the activation fails, then follow these simple 3 steps:
1) Verify you have Internet access by opening a browser.
2) Open a Command Prompt.
3) Enter the following command replacing the formatted Xs with your Product Key
slmgr.vbs –ipk XXXXX- XXXXX- XXXXX- XXXXX- XXXXX