Which operating system are you running?
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Which version of Windows 10?
Did you do any Windows updates before Lightroom failed to start?
Have you tried re-setting your Preferences?
I think so
It is "windows 10 home"
Os build 14393.1358
Try re-setting your Lightroom Preferences per the steps given in the link above.
I will try that. Thanks
Sadly, it didnt work. I successfully accessed the command to reset
preferences, said yes, selected a catalogue, the opening screen appeared
but the catalogue never loaded. When I clicked on File, or Library, it
said LR was not responding. I got the sam response when accessing an older
backup catalogue, so I dont think that is the problem. I found that
several of my most recent catalogue and backups carried the lock file. It
had not apparently been removed when the program was shut dowm. But going
back to a version of the catalogue that did not have the lock file also