system
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Sorry for not replying sooner but the problem deteriorated and my computer wasnt on long enough to write and post a reply before shutting down.
Then twice the computer did not respond to the keyboard - problem went away on reboot.
This got me to thinking, as Eddy said “The problem is finding out what is calling that registry entry” plus with the keyboard playing up, could it be hardware related and not a virus.
If an intermittent fault with the keyboard was responsible, ineffect generating false keypresses that lead to the spawned calculator and the shut downs and also muting the sound. I replaced the keyboard and problem went away!
Thanks for the advice - I’m off to investigate the Userenv issue!