digmor crusher Sorry, my fault, I should pay more attention In the distant past there were problems with system monitor (System Safety Monitor) type software and Zemana coming into conflict with Shadow Defender I would maybe look at software that runs at a kernel level as being a possibility for conflict. Something that locks horns. In the olden days for example they used to say that we shouldn't run two anti virus at the same time because it would lock up the system. I guess they end up fighting over the same 'territory' and come to an impasse. I know this is not the language of an expert on these matters but I am no expert. Just some thoughts.