It's the Windows Messaging Service. While logged in as an Administrator equivalent, go to Control Panel --> Administrative Tools --> Services. Find Messenger in the list, right-click, go to Properties. Click Stop, and make the startup type Disabled. John wrote: >My mum (can you tell I've been doing my Christmas rounds?) has got those >popup messages that seem to be plaguing people nowadays. I don't even know >what they're called .. they are messages exploiting an open port in >Windows XP.