Thanks for the welcome, Bob.

I think maybe I’ll rip Avast out and re-install. I’m not sure what the abortive installation of NG will have left behind. I’m not keen on the idea of there being half-installed virtual machines lying around. Obviously either this solution doesn’t install cleanly, or my hardware is not really up to running it. Either way, I’m going to continue to live without it. I’ll make use of your link, thanks.