My dad, obviously! 
To be fair to him, the first was written in 1995, and Word is about as advanced as Dad ever got on computers. But I have two as-yet unpublished novels written by friends that AFAICT were composed in Word. What’s wrong with Word for a text-only manuscript?
But to get back on track,
I may try this, because this attack seems similar to a previous one Dad experienced several years ago. IIRC, on that occasion, they hadn’t actually installed anything, but this one seems a little less inept and more insidious. Fortunately, I now live in Massachusetts, so flying to Maryland is not as much of a big deal as coming back from Nevada.
Thanks for this recommendation. It looks impressive, but it seems to need a live connection to the internet, and I’d be concerned that the hackers might detect that the machine is online and interfere with it, or just continue their hacking while it runs. Am I mistaken?