Currently use Avast! and AdAware, combined with such common sense as I can muster. Have used F-Prot in teh past,at work, and found it excellent.

Incidentally, one of the labs I teach in has had some curious problems with items disappearing from the Start-Programs menu. Even though the application is still there, this can be confusing for beginning users or the IT-challenged. Our computer services people reckon it's due to a virus picked up from removable media. They suspect the student is ignoring warning messages and the virus is getting through. I hae me doots! Anyone come across virus with this type of effect?

Regards