Linux works best!! LOL ...seriously ....since I shifted to Linux, I can use more of my cpu cycles for my apps rather than antivirus(Norton used to eat up a lot). On the other hand , I still have retained WinXP for certain
windows only apps....and till now I dint have huge virus problems since I am using AVG Free Edition. Also I have Sygate firewall , the windows firewall is not as reliable.But wht I have noticed so far is, if you use your computer with a little more care, no viruses come. For example shifting to Firefox/Opera solves half your problems. Also keep a limited user account and use it for potentially infectious activities( I mean pron

)Using this strategy , a friend of mine actually manages with no antivirus (he cant use coz he has P3 866Mhz and cant spare cpu power for anitvirus! ) ..he has had no trouble for the past 2 years