Husam,
Shoot the Messenger. Actually, something called the 'Eindows Messenger
Service' which has nothing to do with your MSN Messenger or other chat
software, runs by default and without your consent under WinXp, WinNT,
and Win2000. Popup ads can be broadcast to this service without needing
your e-mail ID or even your browser. Download the small 22k utility,
aptly called Shoot the Messenger from grc.com and disable this service
immediately, as it is also a serious security risk.
Pranav