You will need
  • computer, browser, antivirus (optional) firewall (optional) administrative rights to the computer.
The site is blocked in browser settings:

In Internet Explorer go to menu "properties" — "Internet options" — "content" tab — click "insert" — "approved sites" — enter in the address of the website you want to block (for example and click "never." Perhaps the browser will prompt you to enter a password. Enter a simple password to nasabat.
In the Opera browser lock website is the following: from the browser menu, go to "Settings" — "Advanced" — "Blocked content" and add the website address.
For browsers Google chrome and Firefox there are special add-ons Blocksite(for FireFox), and Personal Blocklist (for Chrome). To install these add-ons you can on the official websites of these browsers. They are quite easy to use and configure. To block a website in settings of these plugins, simply adding the website address in the box provided and clicking "add filter".
However, the blocking of the address of the website in your browser settings not the best way and is suitable only for those who are accustomed to using one browser. And settings, each browser has the ability to block objectionable website.
Therefore, the optimal strategy is to block the sites or settings of the firewall of your antivirus or in the settings of your personal firewall-a.
In recent times, there are so many free versions of these programs (e.g. NetPolicce, Jetico, etc.). To stay settings we will not, because they are slightly different from each other and their detailed description will take a lot of time. To obtain detailed information about configuring them on the official websites of these programs and even (some of them) to the online consultation of experts. This method is best suited if you want to block access to certain sites their children.
And finally last but not least, an effective way to block access to certain URLs is to edit your hosts file with ease.
hosts is a text file that contains a database of domain names, used in their translation in network addresses of the nodes. Request to this file has higher priority than referring to DNS servers. Unlike DNS, the contents of the file controlled by the administrator of the computer.

Open the file C:\\WINDOWS\system32\drivers\etc\hosts c a Notepad. Before doing this make sure that your folders show hidden and system files. Write to the end of the hosts file the following line:
where is the ip address of your local host, and address of the website you want to block. If you want to block a lot of sites, then each entry in the hosts file must begin on a new line. Don't forget to save the entry in the file.
Now, if you type in the browser address block of the site, your computer will direct you to your local address and you will see "Server is unavailable".