i had this problem, i thought i could fix it by going into "msconfig" and taking it off of the start up list but this didn't work. I had to go down to system tray at the bottom right of the screen, right click on the messenger icon and click on "open". then go up to the top of messenger and go to "tools" then "options". In the preferences tab uncheck the "run this program when windows starts" options. That should do it.