Yesterday I did the usual monthly Windows 10 updates, which have always been OK before. However the latest - KB5001330 - seems to have given me some problems in that the PC would hang on at boot up, and eventually having to go through the repair procedure. So for now I have uninstalled it, and it seems OK so far.
I'm just really posting this in case anyone else has any problems with it. An internet search doesn't bring up anything specific so far for this particular update.