One of the most common errors that users report is Avast UI failed to load on their system whenever they try to run this antivirus software. Restart your PC and try to open Avast Antivirus again. Ensure the General tab is selected, then click the drop-down menu next to Startup type and select Automatic. In the Services console, locate and right-click Remote Desktop Services, and select Properties.
How do I update my antivirus definition?.Why is my Avast Antivirus not updating?.
