How to fix the error message: 'This copy of Windows is not genuine' 


To enter a (new) key you first need to follow the steps below:


1. Click on Start button or Start ORB and go to All programs -> Accessories.

2. Now right-click on Command Prompt shortcut and select "Run as Administrator" option.

3. Now run the command slmgr.vbs /rearm

4. The Message Command Completed successfully should show after a few seconds.

5. Reboot the computer and enter you product key