http://members.tripod.com/~rescom/index.html

Kidnet Explorer works with the Internet Explorer ActiveX Web
    Browser Control to set up a browser for your kids that restricts
    them to sites containing material appropriate for them. Browsing is
    commenced from one of the approved safe sites, and there's no
    location window, so your kids can only visit sites linked to by the
    "cool sites list." There's also a site blocker to automatically
    prevent the browser from pointing to specified URLs. Search
    engines are also blocked by the URL blocker. Kidnet Explorer
    uses the multimedia features in Internet Explorer to provide a rich
    browsing experience. If you're worried about what your child is
    seeing on the Web, Kidnet Explorer can help you make sure they
    stay in safe territory.

Minimum requirements:
Windows 95, Internet Explorer 3.0