im assuming that you mean the messenger service
the little gray ads that randomly pop up when ever they please lol
i got a fix for ya
To make it so others cannot send these messages to you, disable the Messenger service from Services. (Go to Control Panel > Perf. & Maint. > Administrative Tools > Services. Double click the Messenger Service, change 'Automatic' to 'Disabled' and click the Stop button.)
and if that doesnt work for ya try it this way....
Start > Run> Type: services.msc
when the Services window pops up scroll down to "Messenger" the description is "Transmits net send and Alerter service messages between clients and servers. This service is not related to Windows Messenger. If this service is stopped, Alerter messages will not be transmitted."
Righ click go to Properties and in startup type select "DISABLE"
DON'T worry this has nothing to do with Windows/MSN Messenger instant messenging programs, this is a different thing, as the description states!
lol you owe me a beer