Must block website by Keyword NOW. Help please!

Folks, I need to find a way to block certain pages on a website that contain a specific keyword.
I won't go into detail, I just need to.:mad

I've already got my Linksys router to block keywords that appear in the URL, but can't figure out how to do it when they keyword appears on a page of a website.

Whatever method I use must either be a hidden install or router based, and Linksys can't seem to figure out how to get thier keywords-based website blocking to work.
Essentially, if the page contains the keyword, I want it blocked.

Any ideas?
Operating systems: Windows Vista 64 and Windows XP 32.

 

this one is listed as working with IE but all they would have to do is install another browser, so not sure this will help you http://majorgeeks.com/IE_Xtreme_d4742.html might want to look through the browser section... file is old and sys specs might not work.

Lots of post re same like this one http://forums.majorgeeks.com/showthread.php?p=1177810

 

after thought...

Not sure if its kids you want to block but ATT/SBC has parental control software, think most ISPs do, some might have keyword.

Also you could look at your OS controls to see if limiting would work for that login.
http://windowshelp.microsoft.com/Windows/en-US/Help/ff9aa367-0420-4b84-86cd-45bd898fccef1033.mspx vista

This is not pricey and provides keyword http://www.kidswatch.com/more_advanced.html

"Block access to keyword searches and web site addresses containing those same keywords"