Follow the instructions at the link below.
I use Yahoo for a search engine, but whenever I reboot, ms messenger is running in the background. Even after I go to msconfig and uncheck it and run in selective start. I know something else is using ms messeger and you can shut it off, I've done it in the past, but for the life of me I can't remember what's using it(old age is hell). A couple years ago I seen a segment of "Call For Help" on "Tech TV" is where I learned this. Thanks