Block websites without any Softwares

Go to C:\WINDOWS\system32\drivers\etc
Find the file named "HOSTS".
Open it in notepad.
Under "127.0.0.1 localhost"
Add 127.0.0.2 www.sitenameyouwantblocked.com , and that site will no longer be accessable.
-So-
127.0.0.1 localhost 
127.0.0.2 www.blockedsite.com
- www.blockedsite.com is now unaccessable