Create_Scheduled_Task_As_System.ps1

            $ScheduledTaskName = "Scriptname"
            $Time = "00:00"

            $Argument = ("-executionpolicy bypass -file 'C:\Scripts\Somescript.ps1'")
                        $TaskParams = @{
                Action      = New-ScheduledTaskAction -Execute 'powershell.exe' -Argument "$Argument"
                Trigger     = New-ScheduledTaskTrigger -Daily -At $Time
                Settings    = New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries -RunOnlyIfNetworkAvailable
                Principal   = New-ScheduledTaskPrincipal -UserId SYSTEM -LogonType ServiceAccount -RunLevel Highest
                Description = "Run $($ScheduledTaskName) at $Time daily"
                }

            Write-Output "Creating scheduled task called $ScheduledTaskName "
            Register-ScheduledTask -TaskName $ScheduledTaskName -InputObject (New-ScheduledTask @TaskParams) -Force       
            $task = Get-ScheduledTask -TaskName $ScheduledTaskName -ErrorAction SilentlyContinue
            if ($null -ne $task){
                Write-Output "Created scheduled task: '$($task.ToString())'."
                }
            else{Write-Output "Created scheduled task: FAILED."}