Program reports unknown error

Hi, I’m using v. 4.7 or rather I’m trying to use it. The splash screen loads, and the memory scan begins but then I get an error message saying ‘The scan completed with error 42000 = Unknown error’. When I click ‘OK’, the program then loads but when I click on ‘Scan’ I get the same message. This also happens when I try to run on demand scanning so I think it must be a problem with the program rather than my PC especially as the program worked fine up until today. If anyone can offer any advice, I’d appreciate it very much.

See if a repair of avast solves it. How to do it has been explained many times on this board.

Please update to the latest 4.7.938 version.
Maybe the problem is solved…
Professional or Home version download.