I would like to know if there is a way that I can block certain websites in Windows XP, obviously with administrator power. For example, what can I do either in windows or what other program can I get / download so that I can prevent the other users from going to certain sites. Say i would like to block users from going to www.yahoo.com what do I need to do, so that when the user goes to that site it will not even load for them.

Any solutions to this, all ideas are greatly appreciated.

Thanks