in windows xp
.click on start
.than select run
.type " services.msc "
a list of all the services running will be shown
.select the "messanger" service (a new popup window will open called messanger properties)
.in messanger properties "stop" the service status
.then change the ..startup type to "disabled"
click on apply...and yer done
enjoy yer popup free computer now
i dun have any other operating systems installed so i dont know if wut i've typed here will work on other OS.