The TeamViewer VPN adapter is not installed

Hello there,
After I finished to work with TeamViewer 7 this error appeared and I don’t know what ID is missing. When I want to connect with another PC this error appear again. How do I fix this ? Also the reinstall of TeamViewer is not working and please tell me what is causing this error message ?
Thanks !

TeamViewer
TeamViewer
The TeamViewer VPN adapter is not installed on your computer. This adapter is required in order to create VPN connections. Administrative rights are required in order to install the TeamViewer VPN adapter.
OK
