Definitely avast's side. So please work this out. I am very sure a whole load of users out that are flaring with the same problem because a lot of games uses the gameguard and I do not want avast to be the reason to ruin the games because this anti-software has high potential.

Yeah. And the main question here is: has anyone of the users who complain to AV vendors actually approached the rootkit vendor and ask them to fix their rootkit incompatibility instead? I still feel this Gameguard thing should be detected as rootkit, not whitelisted.