Yep , I have all the updates, etc and run zone alarm, AVG, Spybot and spyblaster with a proximation program with the service pack 2 firewall and such ta boot so I have no dog in this fight. I have never used Mac so can't say pro or con whats best.
My advice is to get the superior weapon - the Mac.
The service pack ruined my laptop. Every other day I have to go through the blue screen of death ritual. I just bought an Apple ibook which is very entry level. I pay attention to these threads even with the flame wars so I can learn. Sure is entertaining though
;-)