Win7 shared an error when the internet is shared null

Today's notebook computer
When sharing wifi comes out, you need this prompt when setting up connection sharing. When Internet sharing access is enabled, an error null appears.

This problem is generally the security guard of the computer. The software shutdown within the optimization master disables some services. Please share the solution below;

1. Keyboard combination key&ldquo ;win+R”Open the run, enter services.msc to enter the service;

2.Application Layer Gateway Service and Windows
Firewall generally these two services will be closed;

3. Just click the right button "Properties" and "Start" <;, you can solve the problem of sharing errors. Finally remember to restart the computer.