I've been left in charge of our computers and network at the school I teach at. Our server runs Windows Server 2003 and our workstations run Windows XP.
I would like to block certain sites (mostly social networking stuff). I searched this forum and found an old post about using a GPO and the content advisor for IE. It blocked the bad sites nicely but also blocked Google. Perhaps I missed a step somewhere but any advice on how to do this properly would be appreciated.