Although the Internet holds a wealth of information, it also contains a vast amount of objectionable material as well. Whether you have a child or run a public network of computers, it is necessary to block specific websites that may have a negative influence on web users. Blocking websites with password protection is one of the most effective methods to control the content of the web. Luckily, Windows Vista has a variety of user controls that can set restrictions on specific web content.
Click Start > Control Panel > Internet Options.
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Click the "Content" tab on the top toolbar and select "Parental Controls." Click "Create a New User Account." To set parental controls and block web content, you must create a new user account.
Enter the new account name and click "Create an Account." If you are creating an account for a child, enter her name.
Select "On, Enforce Current Settings" under the Parental Controls option. Click "Block Some Websites or Content." Click "Windows Vista Web Filter."
Click the "Edit the Allow and Block List" link. Enter the website address into the space bar and click "Block." Click "OK" to close.
Restart the computer. Click the new user name icon and set the password at the log on screen. A password will now be required to access the specific websites that are blocked.