In Visual Studio you can use the keyboard shortcuts that will comment/uncomment the selected lines for you:
Ctrl + K + Cto comment
Ctrl + K + Uto uncomment
For Visual Studio 2013, to reset the settings for Visual Studio go to Windows > Programs > Visual Studio 2013 > Visual Studio Tools.
In the File Explorer window that opens, choose Developer Command Prompt for VS2013.
Then enter the following at the command prompt and hit enter:
Although the one below may not work, you may need to also need to enter:
If devenv /resetallsettings does not work, it is not necessary to reset Visual Studio.