I am also considering switching to Avira. I installed Avast! on my new Compaq laptop (C768TU with 2.5GB RAM) and it runs like a dog with Avast resident protection enabled. However, I am concerned that the free edition of Avira may not be as feature-rich as Avast! (in terms of on-demand scanning etc). I currently use ESET Smart Security on my desktop, but I may transfer it to this PC (the laptop) if I find I use this more than my desktop. Still not sure what to do in that regard.