What a load of FUD. Anti-virus, even Microsoft's MSE, cause huge slow downs for any PC. Read: http://www.codinghorror.com/blog/2007/02/choosing-anti-anti-virus-software.html
Anti-virus is not akin to car air bags at all. UAC is that. Anti-virus is more akin to those traffic wombles that come along in their 4x4's and set out road cones AFTER a road accident has happened.
Lol. Just lol!
AV does not cause huge slow downs on all PCs ffs. I run Avast on an encrypted hard drive on an ultraportable laptop and can see absolutely no difference in performance with it turned on or off. Performance is fine and battery life is hardly affected. I'm not sure what you're doing but if my little low-voltage ultra portable laptop can cope with it I'm sure desktops will be fine. In fact my mate runs Avast on his netbook atom based laptop and it never has a problem!
Plenty of people still get viruses who have AV installed as they are not 100% accurate, but I'd rather be safe than sorry and catch the percentage of threats it will detect. At work we receive virus alerts from clients that have visited real legitimate sites that have been hacked and have bad code embedded. People in this thread who say they are safe because they only visit known sites are kidding themselves really.
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