I have 2 home pc's exactly same specs, but different printers and a few different programs on each - one works fine with MBAM3 - the other freezes up on startup and shutdown with MBAM3. I have tried installing MBAM3 a couple times on the one which freezes and the problem returns each time. So, obviously something installed on that pc does not play well with MBAM3. On that pc MBAM2 does work, so for now I will continue using MBAM 2 on one pc and MBAM3 one one pc. Wish I could figure out what the differences that cause the problem are. But, hopefully a solution will come soon from the MBAM crew. I have had MBAM for several years and had excellent experience with it until Version 3.