Avast > AVG, AVG can be evil.I was using Kaspersky and even closing it doesn't help. I just uninstalled it eventually and stuck with AVG. I've had no problems since.
I use Avast since version 4.7, and haven't seen error except maybe when Dolphin was so buggy, it kept popping random errors (I think).I use Avast, and I get this message once for every new revision I try but after that I never get it again. Maybe Avast just does this memory demanding thing once for every program or whatever?