Lingering virus issue disables displaying of hidden files

A previous virus infection disabled the ability to show hidden files
in Windows Explorer. Whenever I try to show hidden files the command
appears to run okay, but when I return to check it has reverted to
hiding the hidden files.

I have scanned the computer fully twice, but the behaviour persists.
Could it be some change to the Group Policies that has caused, or are
remnants of the virus masquerading at legit programs?

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