i used norton antivirus 2002, which cames with the purchase of my computer in the past and it is a resource hog... it really slow down my computer when scanning... it is fine in the detection of viruses... but really slow...
after my norton antivirus subscription expired, i make a switch to avast home edition... it seems fine, but the 30 days subscription thing is really troublesome... and i dont really like avast... it have too many features... never find anything on my computer... maybe my computer is clean...
not long after, i make a switch to BitDefender (i think is the free version)... and this one is the worst... i cannot update the defination of the virus signature... terrible... and windows xp sp2 security does not recognize it... uninstal it right away...
and to avg free edition... like it very much... simple, fast and uses very little resources... but heard many people said that avg antivirus free edition only quarantine viruses that it found... not very sure whether this is true... but avg is really nice... this antivirus found 80+ viruses on my friend computer...
now, using symantec antivirus corporate edition... not a resource hog... it runs smoothly on my computer... nice antivirus...