Can disable browser usage yet keep computer open?

Hi, I have a problem with employees using the company computers for internet browsing when I'm away. It would be simple enough to password protect but I need the computers on. My question is (I'm using Win 98) there a to disable the internet browsers yet keep the computers on?

Appreciate any ideas

 

You could have a series of host files:
http://www.mvps.org/winhelp2002/hosts.htm
Theirs blocks parasite websites.
The way I see it, if you had one that read:
127.0.0.1 *.com
127.0.0.1 *.net
127.0.0.1 *.org
It should virtually go nowhere on the internet.

Copy and paste whichever one you wish to use into the Windows folder.

Matt