How to block website on computer without using any software tool in windows 7

Find the path c:\windows\system32\drivers\etc
Look for a file named as Hosts -> open it with notepad -> at the bottom of the
file, add the line as shown below
127.0.0.1
www.blockingsite1.com
www.blockingsite2.com
Is an example of website URL, which you wold like to block, just replace it
with the actual URL so that they are unaccessible to all -> At the last line of
the URL that you have entered. Add an extra carriage return by pressing
enter -> save and close file.
Once you have completed above steps, all website you have entered will be
blocked with immediate effect.