When using TeamViewer, sometimes it is necessary to restart the program (for example, if you connect to a VPN and TeamViewer loses its connectivity). The steps below detail the restart process.
Click on the TeamViewer Icon in your System Notification Area.
Select Exit TeamViewer.
Click Yes on the Close TeamViewer dialog (if it comes up).
Click the Start Menu.
Click All Programs, then TeamViewer Host 5, then TeamViewer Host 5.
The TeamViewer Icon should appear in the System Notification Area again.