remove teamviewer and change MAC

1. uninstall: ‘Start’ –> ‘Settings’ –> ‘Control Panel’
2. Click on Start –> Run –> type %appdata% –> delete TeamViewer folder and also delete “C:\\Program Files\\Teamviewer”
3. Delete registry folder: hkcu/software/teamviewer and hklm/software/teamviewer
4. Change the MAC Address: http://www.irongeek.com/i.php?page=security/changemac
5. Clean your systems registry – you can use a free registry cleaner for this purpose- http://www.techbuzz.in/how-can-i-clean-my-computer-registry-for-free.php
6. Install a fresh copy of Teamviewer. Select the ‘Personal Use’ option.

Thanks to:
http://www.techbuzz.in/how-to-reinstall-teamviewer-after-it-has-expired.php
http://www.irongeek.com/i.php?page=security/changemac