Protection for Yahoo Instant messanger

I use NAV2008 on a comp with Vitsa Home premium OS

 

I use yahoo Messanger  version 9.0.0.2338

 

Does NAV2008 protect this program?

When I go to my Norton settings, under internet worm protection, there is a box for yahoo messenger to be protected, but I can't check the box. When I hit search for messenger programs (I assume meaning on my machine), I get the response

"no new instant messenger programs found"  I do this check logged in as the admin for the computer