system
3
Thanks David. I checked for AvastEmUpdate.exe in CCleaner under the ‘Scheduled Tasks’ tab the the ‘Tools’>‘Startup’ section. Regarding the Comodo Firewall: I find it has not the most intuitive of user interfaces and so I am still learning how to delve beyond the basic usage. I will investigate what you suggest - I have manually added AvastEmUpdate.exe and instup.exe to the Comodo allowed programs list as they were not listed there before.
I wonder, perhaps, if Comodo is the problem, whether I should completely uninstall it and re-enable the Windows Firewall in the short term to see if Avast then works as it should. I could then reinstall Comodo from scratch and hope that I set it up correctly.