How to Block A Website On Your Computer

Login with Admin
Open My Computer/Computer
Navigate to your Operating system drive (Usually C drive)
Now go to Windows –>System32–>drivers–>etc
Here you will see your Hosts file.Open this file in notepad.
Now move to the last line in this file and add the address of the website to be blocked prefixed by 127.0.0.1
Example
127.0.0.1 www.facebook.com
lets enjoy......