How To Block a Website In All Web Browser (windows operating system)

Login as a system administrator(Not a User)

step 1 

start - run 

step 2 

open the "hosts" file location 

 c:\windows\system32\drivers\etc

Double-click on hosts and open the document using Notepad.

Example

you want to block YouTube.com on your computer.

               

Save the file

The browser cant connect youtube.com.