I just recently installed Windows 8 on my home computer. During the installation process, I was not asked to provide a product key. This led to me not being able to activate Windows after the installation process.
To resolve this, follow these steps:
Command Prompt and select
Run as Administrator
Windows+C to bring up the Charms window
Settings and click
Change PC Settings
Activate Windows tab will now ask you for your product key
Oddly enough, I had trouble finding this info so I thought I’d share.