More work will likely be needed to determine the cause/solution, preferably on one system at a time.
Cheers, MM Hi, @devilus: Yes, as suggested by @quietman7, it would be a good idea to CLEANLY update to the current build (22.214.171.1243).
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You mention that you are running MBAM Free; however, if any of the affected systems runs MBAM Premium, please be sure to deactivate your license before uninstalling (as explained in the sticky topic for which @qm7 provided the link).
Either way, please carefully follow ALL the steps, especially rebooting when prompted by the removal tool. Windows 7 with MBAM 126.96.36.1994 is already a clean install.
Hello williamhigginson,this is commonly the result of an infection.