Well I would think that in lots of cases malwarebytes will detect the same malware and even virus as a standard antivirus package and malwarebytes can run in real time too, so as reagards running two antivirus packages at same time (which I am not doing) it does weaken the argument that two antivirus packages will ruin your system, though personally I wouldn't do it.
But my main concern is this aswrec.dll file I don't really want any adware or malware files particularly if it is bundled with a package such as avast.
Joe