How to Block or Unblock websites

Many times in schools, colleges & offices surfing some sites like orkut, etc are banned ! To overcome this you can unblock these or block some other websites and play pranks ! Do The Following : For eg you want to block www.xyz.com ! * Open the folder C:\WINDOWS\system32\drivers\etc * There you will find a file named HOSTS * Click on the file and press SHIFT and now right click on it . * From the right click menu select Open with . * Now, select Notepad to open the file from the list ! * Now, in the file under the line 127.0.0.1 localhost add another lines 127.0.0.2 www.blablablabla.com. * Now, File>>Save ! Now, open your web browser and try opening www.blablablabla.com , it will not load ! To unblock sites just do the opposite !