If you goto Start > Run and type in msconfig, a window will open for your Sytem Configuration utility.
Click on the "Services" tab, and you will see all of the services that are running in the background.
Many of these services try to send messages back to their programmers. EG Microsoft's Messenger, (not to be confused with MSN Messenger), wants to send messages to Microsoft. On my Dell computer I have a Promise Raid 0 hard disk configuration and it has a messenger service also.
Many of these are not needed for Windows XP to run smoothly and you can disable them. But some "are" needed, and if you disable those you will lose functions on your computer.
and do a search of the tasks you have running, and see what can be disabled and what are required.
This just started with my computer yesterday I believe. It occurs pretty well only when I start up my computer.
I have symantec which scans all outgoing messages auotmatically for me, and when I start my computer up and at other random times this symantec pops up constantly, saying it's sending a message. When it does this I have no idea I'm sending a messgae to anyone, I'm not even logged into outlook or anything. Anyway, obviously somewhere on my computer it's automatically sending out 100s of messages to people I don't know. I'm assuming it's a bug, or spyware of something like that.
Now, I have spybot search and destroy and I run it and nothing comes up. The messages still goes. I scan with Norton antivirus and nothing there either.
It's really weird, because there are no "messages" being sent right now, but five minutes ago it was attempting to send 50 or so.
I'm running XP if that helps at all.