Internet filtering with IM Lock Software.  IM Lock is a handy
desktop utility to filter internet use on the desktop.  IM Lock
filters internet at the program level, and provides a handy tool
for administrators and parents use to use as a pc internet filter.

You can download a free internet filter trial on this website.

As a content filter, you can filter content at the keyword level,
and the web filter will not allow users to access sites with
those keywords in their title or url content.  Users bypass other
filters by using internet proxies.  With IM Lock, by filtering
internet proxy keywords, this problem can be avoided by filtering
the proxies themselves.  In conclusion, if you want an internet filter
for a PC that does web filtering, IM Lock may be the utility for you.