Type: Posts; User: Cider; Keyword(s):
here we go: http://windows.microsoft.com/en-US/windows7/Using-Content-Advisor-to-help-block-inappropriate-web-content
Nihil is correct, the restrcited sites stop interaction with your PC ( active X, javescript blah blah). I think you are looking for content advisor. Alternatively you can blockit via DNS...