Can't open Avast

Advice needed. I have used Avast for years and am delighted, and also pay for VPN. For some today I cannot even open Avast

What are you doing to open it (avast should be running) and what it is that you are trying to open ?

Is the Avast tray icon present, that should allow access to the Avast User Interface ?

Are you getting any errors displayed to the screen ?

Many thanks for replying. Clicking the icon does nothing, and there is no message

If I delete and downlosd again will I lose my paid VPN ?

No but before you do that, how about answering the questions David asked ???