While I've used Free AVG and AVAST on Vista installs, with that new UAC how did they install those viruses? Remember that most of the protection is who is at the keyboard. Witness that horrid XP ANTIVIRUS 2008 that has suckered far too many in.
Have you chatted with them about how these got in?
im just finished sorting out my friends computer cause it was slow and full off virus ive reinstalled vista but he needs a good antivirus on my computer i have norton 2005 cause i know its good and it dosent take up much of the systems resources is there a way to get 2005 to work on vista or is there a newer norton which dosent take much system resources like 2005