Are you sure Avast is actually installed on your system?
Absolutely YES I'M SURE it is installed on that computer. Right in the list with the VPN, Secure Browser and Cleanup Premium. It was working fine before the major Win 10 update. Maybe check with Microsoft about WTHeck is going on?
I have no issue loading the secure browser or opening the security and privacy center. Selecting bank mode from the security and privacy center goes nowhere. I intend to eventually use that other computer to wean off of Win7 and switch to Win10. I use bank mode for lots of sites besides financial sites. It keeps me logged in on those sites for a long time which I really like.