I've been using avast! for a couple of years without any problem with PowerTools. For this experience, I also know that, although it sounds quite incredible, that avast! scanner flags as 'infected' executables with bugs. Yes, that's not made up, it happened to me a couple of times with another software (XMPlay) that had some tiny bugs, and after those were fixed, avast! didn't detect the software as 'Trojaned' anymore, although in this case, it used heuristics to detect that possible Trojan instead of the iAVS like in this case.
