Since this is so irritating and you need to stop it I offer here what is already on the net.

Every time you signon or bootup your machine is probably sending out code - unreported like MS OSes do - to a remote server.

Now for it to do that there HAS to be something in you machine to make it happen so, I am assuming stuff here so if John or Joe O jump on it - ignore my suggestions.

If you are using a Unix system then it is as easy as cake, and you should already know where to look, ie cache directories. If MS Windows you need reboot out into DOS from a Floppy.

Then delete all the temporary folders with deltree/y command.
You can make a lnk file in Unix or a bat file in winderz to achieve this.

Example file for 98
Cleanup.bat
CD \
CD windows
deltree/y cookies
deltree/y history
deltree/y temp
deltree/y tempor~1