Thanks for the input, Eddy.
Will try to download the latest version of Avast – on both computers.
The HP printer is connected to the Dell desktop by cable.
The laptop computer is not connect to anything, usually used in another room when turn
on a couple of times a week.
We are using internet connection sharing through the desktop.
Also we are using a reasonably new Netgear router and Xfinity cable modem, but the laptop
is not physically connected to the router or modem.
Believe this answers all your questions.
Thanks again for your input to date.