Error 720 Windows 8.1 Pro

Question

      
When I try to connect to my work with my vpn connection I get below error :
Error connection to VPN. Error 720. I have Windows 8.1 Pro
They advice me to reinstall the tcp/ip protocol but I can't because I can not click on uninstall. Can you help me resolving this (below point 2) problem?
Uninstall the TCP/IP protocol. To do so:
In Control Panel, double-click Network and Dial-up Connections, right-click
Local Area Connection, and then click Properties.
Under Components checked are used by this connection, click
Internet Protocol (TCP/IP), and then click Uninstall.
Follow the on-screen instructions to uninstall TCP/IP.
Restart the computer when prompted, but click No if you are prompted to allow Windows to enable a protocol.
Right-click This PC, and then click Properties.
Click the Hardware tab, and then click Device Manager.
On the View menu, click Show hidden devices.
Under Network adapters, there should be no WAN Miniport IP devices.
Reinstall the TCP/IP protocol. To do so:
In Control Panel, double-click Network and Dial-up Connections, right-click
Local Area Connection, and then click Properties.
Click Install.
In the Select Network Component Type dialog box, click
Protocol, and then click Add.
Under Network Protocol, click Internet Protocol (TCP/IP), and then click
OK.
When the protocol is installed, click Close.
Reset the modem by turning the power off and then on, or for an internal modem, restart the computer.
Test your Internet connectivity.

Answer 1

Hi ,
“They advice me to reinstall the tcp/ip protocol but I can't because I can not click on uninstall”
Please try the following steps to reinstall the Tcp/IP protocol:
1.Press the start button then right-click My Computer > Properties.
2. From properties go to Device Manager; if you are using an older version of Windows you will need to click on the hardware tab to get to Device Manager.
3. On the Device Manager toolbar click on View and then click on Show hidden devices from the menu list.
4. Now locate Network Adapters and click on the “+” sign next to it. If there are no WAN miniports then you can go right to the “Reinstalling TCP/IP Protocol” section. If you do have WAN miniports and they have yellow exclamation marks then proceed to step
8.
5. Get to the registry editor by clicking the start button > All Programs > Accessories > Run. Type in “regedit” and click Ok.
6. In the registry editor you will need to find this key: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{4D36E972-E325-11CE-BFC1-08002BE10318}
7. Export this value for later use by right-clicking on it and choosing Export. Name the file whatever you wish and save it to Desktop.
8. You will now need to do a bit of searching. You’ll be looking through each subkey (e.g. 0001) to find which one matches up with your WAN miniport driver with the exclamation mark. To determine which one corresponds, you will need to look for DriverDesc under
the Name row and look for the value that is in the same column under the Data row. Once you know which subkey contains the problematic driver, right-click it and delete it.
9. Now you must go back to the Device Manager. Remember to click on View and select Show hidden devices. Go to Network Adapters and locate the WAN miniport that was causing problems and uninstall the driver.
And then take the steps you have got to reinstall TCP/IP Protocol
Best regards