Today I was doing a little research on my computer, when (despite not having any Internet Explorer windows open) two shitty popup ads randomly appeared in the middle of my screen! These were the REALLY annoying ones - video, sound... I have norton systemworks prof 2002 on my computer, with script blocking activated, but I'm very concerned about this problem. If someone can tell me how these ads are able to appear on my computer, and recommend software (stable and maybe even free, but pay is OK too) that will BLOCK these *&*^% things from appearing, that would be sweet. Thanks!