How to Disable the "Fast User Switching?

Solution:

1. Click Window's "Start", then key in command "gpedit.msc"   in the search box;

Attention: If there is message to remind you that type the administrator account  and password, check if your account is in the administrator group and then input your authorized username and password.

2. In the "Local Group Policy Editor" window, Select "Computer Configuration" - "Administrative  Templates" - "System" - "Logon";

3. Double Click the option "Hide entry points for Fast User Switching" in the "Setting" list on the right window;

4. Choose "Enabled" option and Click "Apply";

5. Check by clicking the windows "Start"  to see whether the "Switch User" disabled in the sub-menu of "Shut down".