I have experienced similar issues after I installed the update to my Avast Pro Antivirus on my Windows 10 64 bit laptop. I had black screens, non-responsive screens/apps, most apps including notepad and task manager would not load and I received the following error numerous times “The application was unable to start correctly (0xc0000005). Click OK to close application.” After much aggravation and trying different things, I realized there is a definite issue with this latest version 17.2.2288! I had to start Windows in safe mode to uninstall Avast completely. That stopped ALL the issues. I tried downloading a complete latest version of Avast and installing, but the same issues came back. So again, uninstalled and now frustrated - I just want to back to the last working version but cannot find any archived versions on Avast site.