Solve unknown networks in Windows 7

Starting from last month, the newly purchased laptop was inexplicably unable to access the network. Every time it was prompted [Unknown network], no matter whether it was wireless or there was a network cable, there was no way to identify the network.

Baidu has a variety of solutions, all of which are tried one by one. None of them works. It seems that it is not a great way to go to Rome. At this time, only the road that you come out is the best.

The final problem is that [McAfee Internet Security Suite firewall settings problems], either firewall is disabled, or the firewall is uninstalled, or the default settings are restored.

The problem was so simple that it had plagued an idiot problem for a month, and the system had even been reinstalled. Fortunately, the reinstallation failed.