Removal of unwanted system tray icon?

my pc is working with window xp sp2.suddenly i have noticed a tray iconwhich glows into green/red alternatively and flashing a msg. yer. pc is infected wih lotof spyware;remove them with our programme. I ran my antivirus software and found nothing serious.i searched "add/remove and found no new installation.when i click (left/right) i get a websiteprompting me download an antispyware software.pl. let me know how to getrid of this nuicence?