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 Promptand select
Run as Administrator
Windows+Cto bring up the Charms window
Change PC Settings
Activate Windowstab will now ask you for your product key
Oddly enough, I had trouble finding this info so I thought I’d share.