I'm using Windows 10 (64 bits) and recently, I cannot open Avast Free Antivirus and Windows Defender Security Center.
Everytime I try to open them, they close immediately.
I also tried to go to the Windows Defender Security Center through Settings > Update & Security. When I click on "Windows Security", the window closes.
I uninstalled and reinstalled Avast antivirus and I still can't open it. The icon is showing in the tray bar but when I move my cursor over, it disappears.
I can open Malwarebytes. I used it to scan but it found no threat.