How to Block/Unblock Some Websites in PC?

• Go to Start > Run. Paste the Following URL and Press Ok.

C:\Windows\System32\drivers\etc

• Now,  Right Click on Hosts and Select Properties > Privileges and Grant all to Administrator.

• Now, A Text Editor like Notepad will open. At the Ending of the Notepad, Add the Following line:

127.0.0.1 www.facebook.com

• At www.facebook.com, Enter the Domain that you want to block. If you want to Block more Sites, Insert the above presented line by giving one line gap.
• At the Same time, If you want to Unblock the Blocked website, Remove the Line, Which is Saved in 'hosts'.