Microsoft Windows and Office Activation can be tricky at times and you might get blocked by Microsoft if you try activating more then a few times with a single key to prevent software piracy.

This policy is now being implemented more strictly after Microsoft blundered and offered free Windows 8 keys to users. To prevent such situation one can opt to use handy free utility Advanced Tokens Manager for safe backup and restoration of Microsoft Windows and Office activation files locally for restore when a clean install is done.