Block The Access Of Websites In The Windows:

1.Open Internet Explorer click on Tools and click options.
2. Click on Connections Tab and click LAN Settings Button.
3.In Proxy Server Item Chech the check box "Use Proxy sever for your LAN"
Address:internetaccess
Port: 80
4.Click on Advanced Button and Check the check box "use same proxy servers for all protocals" in servers item.
5.Enter the sites what you want to allow access in the Exception BOx.