If you:
Run Vista or an equally secure OS
Keep it up to date
Everyone that uses the PC is smart enough to only click on safe email attachments
Don't download & run applications from shady places (pirated torrent downloads / warez)
......you really don't need anti-virus anymore, unless your machine becomes infected (which should be never). The software significantly slows down your system, for very little gain.
Vista makes you confirm every time an application is ran....if you DO get a virus, you can just deny it access. Then pick up the software to remove it. Running anti-virus 24/7 is like take antibiotics every day in case you get an infection.
These AV companies want to scare people, and at one time they had a point.....but not now.
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