Dear Samuel, I followed your directions, and this is what happened: Yes, I was able to install MBAM, but I made a mistake. I launched MBAM without setting exclusions in BD. My mistake. Before I could stop it, there was Bitdefender re-installing. It re- installed automatically, and this time I set exclusions, and then everything was OK. So there is some kind of incompatibility, which can be overcome by never allowing BD to monitor MBAM. What should I do now? Now that I caused BD to once again re-install, should I uninstall everything and go all over the whole process once again? Both the programs work now without problems, but I am worried what might have happened during that automatic re-reinstalling. What do you say? By the way, I ran MBAM and found, among other things, six Trojans that had been residing peacefully with BD!