system
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There is no other antivirus program.
I de-installed the OEM-installed Norton, and in addition ran the Norton deinstaller tool. There is a backup programEaseUS Todo Backup that has installed resident parts, but is not configured in any way to operate continuously. I reconfigured the location where WLM has its data folder: it is not in the Users directory, but on a data disk D: .
The web contains a lot of entries of the behaviour of WLM (that I experienced), and associations with antivirus, but not with Avast. This forum reports issues with WLM mostly regarding SSL, but not my issue.