gmc,
I use and recommend AVAST to my customers, but if they insist on spending money on an AV i sugest kapersky, but I have had a couple of cases where kaperskey was killed by trojans/rootkits/viruses, but it did stop the internet at the same time, so I can not save it was TOTALLY useless,
and as far as the POS norton/macaffee/computer associates JUNK, my first recomendation is disconnect the cables to the modem/phone line switch the modem off, then uninstall the products,install avast, update with an update that was downloaded on a clean computer, then schedule a boottime scan of all files AND DELETE ALL infected files, which could number into the hundreds if not thousands, and after completeing the boot I then install spybot S&D iobits advanced system care and their internet 360 and do complete sweeps with all three, and also run a hijackthis and remove any startup items that I ahave not seen before if it is not something that the customer knowes about.
sofar this method of attack usually results in a cleaner faster computer that does not have any significant hangups
harpo