Yes you can , and i have run both succesfully in the past.But ask yourself this...is there any point in having two avs taking up room on your pc and causing potential conflicts?.After using AVG for the best part of three years , then switching to avast , i came to the conclusion that AVG offers no benefit over avast and in fact avast (imo) detects much more anyway.Also with so many free online scans available from kaspersky panda trend etc where you can get a second opinion whats the point in having another installed?.
me