The "Get-ScheduledTask" command is not valid in command prompt. From a much earlier post in this topic:
Run PowerShell as an administrator and enter this command:
Get-ScheduledTask | foreach { If ((xml).GetElementsByTagName("LogonType").'#text' -eq "S4U") { $_.TaskName } }
I am not a PowerShell person, but the way I opened it was to right click on the Windows 10 Start icon in the lower left screen corner and then click on "Windows PowerShell (Admin)" After PowerShell starts, cut and paste the above "Get-ScheduledTask...." command.