I asked yesterday what we might be use to capture video on Windows boxes. On a Mac you can pretty much use included tooling. On Windows 10 there is the Game capture mode in the xBox app or you can use VLC to do it if you want to play about with it a bit. But neither of these is very simple, and neither highlights where the cursor is on screen and even pull down menus were not showing up in my video. Further it was hard to get capture to work on one screen or another. Your more or less had to start the capture app on the correct screen.
I asked a colleague at work today and he suggested Blueberry Software's Flashback Recorder https://www.flashbackrecorder.com/. This is very nice and has a free version that is perfectly adequate for getting support videos of what you are doing and so on. It will record from a window, from one screen or another if you have more than one, or from both screens. In addition voice over is trivially simple; just plug in your mic/headset and speak as you go. The only downside of the freeware version is that it only stores in two formats - its own fbr format and Windows Media Player. But that's probably mostly enough - and if not the cost of the Pro version for home/personal use is not at all bad.
In case this helps anyone else I thought I'd pass it on.