AVG isn't the best AV program for DAWs, IMO. It has become somewhat bloated since its early days and it isn't the best at stopping infections. When repairing computers I constantly come across badly infected computers that I used AVG as the antivirus. BitDefender is a very good low resource AV program and I use it on our laptops, but I use NOD32 on my DAW, which is also low resource and quite good at detection. I use NOD32 when repairing computers- to clean infections off computers that were running AVG, McAfee and Norton.
Avast is a decent program and has a free version - Bitdefender is better and also has a free version, but if I had to choose between Avast and AVG, I'd use Avast over AVG any day.