The "Internet Connection Sharing" option provides networked computers with the possibility to share a single Internet connection.
This does NOT work with VPN.
Solution: "Internet Connection Sharing" should be disabled.
Then try to reinstall the VPN client.
Click Start li>
Click Settings li>
Double-click Network Connections
for each local area connection: right click on the link, then click Properties.
Go to the Advanced tab.
Under ICS, the options "Allow other network users to connect through .." should not be checked.
Click OK to save settings.
Verify 'Internet Connection Sharing" is disabled for each LAN connection.
Close the "Network Connections" window.
then try to reinstall the VPN client.
It could be that you wish to use the "Internet Connection Sharing" at home.
Note that you will need to adjust settings every time you want to use VPN.