After seven years, a new desktop PC! The previous one has served well with only one hardware failure, the power unit.
So as before something middle range for about the same price and rely on Moore's Law to make it better.
GeForce GTX 1060
Aero Cool DS200 case+fans
It is, as advertised, silent.
I could have used a shift everything over utility, but that would have taken accumulated junk with it so I'm only moving specific files and where possible downloading and installing from scratch.
So far, no drama. If anything over enthusiasm, since Windows was grabbing settings from the old machine without asking!
And then I hit an Excel snag. Excel 2016 has integrated Power Query into the main program, it was an optional Addon for earlier versions. In doing so the old XML table downloader seems to have been broken, it fails to Save Maps correctly.
So I had to convert. Power Query is more generalised and is indeed powerful, but it's a complicated pain to learn. There is a button for everything, but where is it?
Today came the big test, running the converted sheet on Excel 2016. Success!
[added] Time to check really old programs: Webedit and WS/FTP are both Win95 vintage, mirrors of their folders have followed me faithfully and... they still work. A test edit of a website page uploaded with no complaints.