To block the website in Internet Explorer just follow the steps below :-
Step 1:- Open any Internet Explorer and navigate to Tools ==> Internet Options. Click on the “Content” tab and Enable the option.
Step 2 :- In the Content Advisor window thats pop up, click on the Approved Sites section and all you have to do is to write the name of the website you want to block. You can use * to block all sub domains of that website.
For example if you want to block orkut in Internet Explorer, all you need is to type *.orkut.com in the text box and click the Never button.
Step 3:- Now click “General” tab in the same window and check whether the box followed by “Users can see sites that have no rating”. Now click on “Create Password” button and set new password to block site with password.
Step 4:- Now try to open www.orkut.com in your Internet Explorer and it will show the following dialog box asking for the administrator password as shown in the fig.