What should I do if the red connection of the win7 computer's network connection icon appears?

            Win7 32-bit system encountered this kind of network failure in the end should be used to solve it? The following small series to introduce it specifically!
1. First, let's go back to the desktop, right click on the desktop computer icon, and then select Manage, In the management page, let's expand <;Device Manager>---“View”---“Show Hidden Devices>---Click “Network Adapter”.
2. In the network adapter interface, we can see a lot of list options, as shown in the following figure.
3. What we need to do is to delete all the devices in the list starting with "6TO4 Adapter" and “isatap.{…}”, select these options, then right click and select Uninstall can.
4. Next, let's open the Network and Sharing Center, then select Manage Network Connections, find the local connection right click, and select Properties.
5. In the properties, we remove the tick in front of the Internet Protocol version 6 (TCP/IPv6) and then confirm the exit window.
After this setting is completed, you need to restart your computer so that the settings you have made will take effect.