Vista can remain virus free untill the UAC (User Account Control) has not been deactivated. Some people deactivate it out of annoyance from the number of times it asks permission before running any program. More over Vista has Autoruns disabled for Removable devices. Which rules out a large...
I ban Mitch for
1) Keeping a avatar that looks like a alien
2) Most importantly, being the person that i've had to comment upon in the last four or five replies that i have posted today.
(some how I endup reading a thread right after he does)
I would go with a Norton (note : there is a mistake with the spelling given on the poll) installation, b'coz there is this gurantee that they will give you a 10 year complete support free of cost, if you can report any virus that their scanner cannot 'detect'.