We know that McAfee doesn't run well if Malwarebytes Pro is installed. I've heard it said that you even need to uninstall Malwarebytes Free version in order to get McAfee to install properly. So yes, there's a potential conflict there.
The Bad Pool Header problem has been noted before and may have more than one underlying cause. Perhaps you've just found another of those causes ...
Edit : checking previous posts others have pointed to a problem with mfehidk. Sometimes running MVT is enough to identify and fix a problem with the McAfee installation. At the very least that would rule out one of the possibilities.