I have been using Malwarebytes 3 premium and Kaspersky Internet Security both 2019 (paid) and 2020 (paid) together with no problems until November 1, 2019. Turned on computer on November 1, 2019 and something happened and spent many days since trying to find the problem. Did a full image restore back to October 27 2019 and problems kept happening so something kept updating. Main issues 1) Steam crashes / freezes and will not download 2) Chrome opens but if closed will not reopen. Bootstrapper.exe seems to be the main file crashing and blocking a system shut down. Also unable to download from a non steam website Paradox Games. Speed test says everything fine and can down load from other sites. Today I was able to download from steam in safe mode ( Windows 10 pro 64 bit ). Next uninstalled Kaspersky and used windows defender. Was able to download from Paradox site that was not working. Next installed Bit Defender - no real change I think. Next turned off Malwarebytes 3 premium and then steam would work and download. Tried turning off each protection one at a time with Malwarebytes with no effect. Had to be all off and Malwarebytes closed. Conclusion There seems to be something wrong with both Kaspersky and Malwarebytes that changed recently ( November 1 ? ) that is causing major problems with chrome, steam, and downloads from some sites. Note I had exclusions in both Kaspersky and Malwarebytes for each other and for steam. I hope any problems in Malwarebytes can be fixed because I really like it. For now both Kaspersky and Malwarebytes are off and I am using trial of Bit Defender. Have not tried Malwarebytes 4 and I did not know about it unless it auto updated from 3 to 4 without me knowing.