if your getting the popups through the windows messenger
service then you can disable it and you will no longer get
them To do so, you'll have to disable the Windows
Messenger Service. Run the Microsoft Management Console by
typing in services.msc at a command prompt, or via the run
box, and pressing Enter. Double-click on the entry for
Messenger, and Choose Disabled as the Startup type, and
click OK. Pop-ups will no longer get through. Of course,
neither will any network messages from administrators
delivered using the service; because of spam, though, the
service is being used much less frequently than before. In
fact, when Microsoft delivers its next XP service pack,
the pack will disable the Windows Messenger Service. So,
if you want to use it after that, you'll have to turn it
on manually using the Microsoft Management Console.
the messenger service popups will show up even if your not
at a web page this is how you would stop those popups.
if your getting popups from web pages you visit then
download one of the many popup stopers available.
hope this will help you out