I have tried many, believe me, many anti virus softwares. AVG was probably the worst among the famous ones because people get drawn to it thinking ok this one is famous, it has to be good. The fact = its not !!

-->I now user Kaspersky - to me its the best because:
*Complex settings and options for those who love to configure/customize their softwares
*Hourly updates.
*It scans like an AV should ! believe me it sweeps through the files thoroughly.
*Not so much a resource hog as Norton or McAfee

-->NOD32 is equally good too but Kaspersky is what i use.
Im totally against Norton and McAfee - No good softwares.
Anyone can take up this challenge - on a system using Norton/McAfee, install Kaspersky and do a full scan and be amazed!