Another method of blocking websites is as below. It is very easy and good. It will blocked the websites you want from all the different web browsers like google chrome firfox, internet explorer e.t.c
2) type 'C:WINDOWSsystem32driversetc' in the run column. You can also access this link through explorer browsing. In the 'etc' folder, select the 'hosts' file, double click it, and open the file in notepad.
3)In the , you will view something like '127.0.0.1 localhost'. For blocking a particular site, you would need to add the number 127.0.0.2, followed by the site which is to be blocked. Note that every site you add, you need to add the last number by one. In the above case, the last number has become '2
4) Then just save it and its done.
This cannot be undone and I am sure it will be greatly appreciated.