From Tom:
Yes, I do have Ad-Aware and ran it, seemingly successfully. However, I read somewhere that, according to some security experts, with proper security precautions, invasions by Xupiter and the like can be blocked. If so, PROBABLY these security precautions involve browser [security] settings. Hence my question as to what the best/proper brower [security] settings are. My IE 5.5 talks about something called a "security level," and mine is set to "medium."
Tom