Avast advised me of a Program update, proceeded with Update.
Ask for Restart, did so.
After restart, No access to Avast UI nor able to uninstall/repair in Programs & Features
Had to check on my Windows 10 TP for Program & Def UPdate, was updated as approx. same time.
Virus Def-141125-1
Program version-2015.10.0.2208