I've been using BitDefender Antivirus Free for the last several months and have been very happy with it. I am running Windows 10 with the 1909 Update and after bitdefender did its update on 4/6/20, when Outlook is opened and BitDefender starts its bugcheck, windows crashes with a Blue Screen of Death FLTMGR_FILE_SYSTEM. I ended up having to use a restore point from 4/1 to get the computer working again and when it downloads the update again, it crashes again. I at first thought it was a Outlook issue and went through a bunch of troubleshooting steps that included reinstalling the app on the computer and it still crashed. When I restored back to the restore point, and once I pulled BitDefender off the computer it stopped crashing when Outlook opened up and all the updates reapplied to the computer. Trying to put BitDefender on again, seems to crash it again. I've resorted to using Windows Defender in the meantime while I did some research to find out why this is happening. I saw a bunch of folks having the same issue on Steam that are also happening after the same updates.