This PowerShell script runs with elevated privileges if not already, then executes a script and restarts the machine and continues after logon, a PowerShell window will appear after logon where the script runs

restart_and_continue_script.ps1

<#
.SYNOPSIS
  This PowerShell script runs with elevated privileges if not already, then executes a script and restarts 
  the machine and continues after logon, a PowerShell window will appear after logon where the script will resume
.NOTES
    File Name      : restart_and_continue_script.ps1
    Author         : Alejandro Palacios (pamanes@gmail.com)
    Prerequisite   : PowerShell V3+, 
                     Minimum Execution policy: Set-ExecutionPolicy -ExecutionPolicy RemoteSigned
                     run in powershell: .\restart_and_continue_script.ps1
#>
param(
  [switch]$PostRestart
)
$ErrorActionPreference = "Stop" 
$taskName = "PostRestartScript"

#Creates a task scheduler entry to continue running the script at logon
function Set-StartupTask($script_path) {
    $taskAction = New-ScheduledTaskAction -Execute "PowerShell.exe" -Argument "-executionpolicy bypass -noprofile -file $script_path -PostRestart"
    $taskTrigger = New-ScheduledTaskTrigger -AtLogOn
    Register-ScheduledTask -TaskName $taskName -RunLevel Highest -Action $taskAction -User $env:USERNAME -Trigger $taskTrigger -Force    
}

function Remove-StartupTask {
    $task = Get-ScheduledTask -TaskName $taskName -ErrorAction SilentlyContinue
    if ($task -ne $null)
    {
        Unregister-ScheduledTask -TaskName $taskName -Confirm:$false 
    }
}

# Get the ID and security principal of the current user account
$myWindowsID = [System.Security.Principal.WindowsIdentity]::GetCurrent();
$myWindowsPrincipal = New-Object System.Security.Principal.WindowsPrincipal($myWindowsID);


 # Get the security principal for the Administrator role
 $adminRole=[System.Security.Principal.WindowsBuiltInRole]::Administrator

 # Check to see if we are currently running "as Administrator"
 if ($myWindowsPrincipal.IsInRole($adminRole))
{
	# We are running "as Administrator" - so change the title and background color to indicate this
	$Host.UI.RawUI.WindowTitle = $myInvocation.MyCommand.Definition + "(Elevated)"
	$Host.UI.RawUI.BackgroundColor = "DarkBlue"
	clear-host
}
else
{
	# We are not running "as Administrator" - so relaunch as administrator

	# Create a new process object that starts PowerShell
	$newProcess = new-object System.Diagnostics.ProcessStartInfo "PowerShell";

	# Specify the current script path and name as a parameter
	$newProcess.Arguments = $myInvocation.MyCommand.Definition;

	# Indicate that the process should be elevated
	$newProcess.Verb = "runas";

	# Start the new process
	[System.Diagnostics.Process]::Start($newProcess);

	# Exit from the current, unelevated, process
	exit
}

Set-Location (split-path -parent $PSCommandPath)
#Remove the task (if exists)
Remove-StartupTask

if (-not $PostRestart) 
{
    #RUN ANY CODE BEFORE RESTARTING HERE
    
    #SETUP RESTART TASK THAT WILL RESUME THIS SCRIPT AT LOGON
    Set-StartupTask $PSCommandPath
    Read-Host -Prompt "Press ENTER to RESTART..." | Out-Null
    Write-Host "Restarting"
    Restart-Computer -Force
}
else 
{
    Write-Host "POST RESTART..."
    #RUN ANY CODE AFTER RESTARTING HERE
    Read-Host -Prompt "Done." | Out-Null
}