Restricting a Website - Simple way -

Suppose you wanna block www.orkut.com then

1] Browse C:\WINDOWS\system32\drivers\etc
2] Find the file named HOSTS and open it with notepad
3] Go to the last line - "127.0.0.1 localhost" - under that add 127.0.0.2 www.orkut.com, and then that site will no longer be accessible !!!

********************************************
C:\WINDOWS\system32\drivers\etc\hosts

127.0.0.1 localhost
127.0.0.2 www.orkut.com
********************************************

If you wanna block more sites you can add more lines to this by addling 1 to the Loop back IP

********************************************
C:\WINDOWS\system32\drivers\etc\hosts

127.0.0.1 localhost
127.0.0.2 www.orkut.com
127.0.0.3 www.yahoomail.com
127.0.0.4 www.gmail.com
********************************************

Group Policy

Open Group Policy (Run -> gpedit.msc)

Go to User configuration -> Windows settings -> Internet explorer maintenance->
security -> double click Security zones

Enable security zones and privacy by selecting import the current security zones and privacy settings -> Click on modify settings -> Click on privacy -> Click site -> In the address of the web site tab add the site name you wanna block -> Click block -> click OK -> OK -> OK

This will block the site.

This configured can be done on the local system or the same can be configured in GPO and can be applied to the entire domain !