Are your users Admins on their systems?

If it's an ActiveX you can block the activeX from installing.

Using REGSHOT or similar take a snapshot of before and after installing and protecting all with SpywareBlaster.
Then using KiX you can modify your systems to block stuff as you want.

http://www.javacoolsoftware.com/spywareblaster.html

Edited by NTDOC (2005-09-26 10:52 PM)