Thank you for your reply. Are you saying that it detects and removes only specific stubborn viruses but not all malware (is MB a collection of one-off programs like the ones that Norton releases for specific wide spread viruses from time to time)? When I say "specific" I mean, for example, it removes virus X, Y, and Z that are known to be hard to remove but no others; if that is correct it would contradict statements I've seen about MBAM's have "advanced heuristics", wouldn't it? I guess I still don't really understand what MBAM is. Of the 7 types of malware that I know of (Viruses, Trojans, Backdoors, Worms, Spyware, Adware, Rootkits) which am I protected from with MalwareBytes? Regards, Jonathan.