>One which would catch things like the one on the shot I sent. With the option to block ALL outgoing traffic unless I allow it. I tried several, and none did. There's mostly no option to block so-called system calls, or if there is (as in Comodo) I couldn't get it to work. They all keep treating that kind of traffic as nonexistent or a priori trusted.

Well, yes, we do have a solid firewall and the ability to decide on all the rules for the outgoing interface. But, I am still to co-relate that with the MsiInstaller issue I am trying to resolve.