MsgBox (VBA) via Windows AT Scheduler?

Question

Visual Basic

Created a reboot.vbs file that reboots the computer after a specified time, but has the ability to cancel the reboot. Double clicking on the file works fine. When added to the scheduler, the restart works, but the MsgBox does not appear, which means there is no way to cancel the restart. What do you advise?
Add to scheduler command:
AT 20:00 /every:M,T,W,Th,F,S,Su c:\reboot.vbs reboot.vbs
file:

Option Explicit
dim WshShell
' Создаем ссылку на объект WscriptShell
set WshShell = WScript.CreateObject("Wscript.Shell")
WshShell.Run "shutdown -r -t 300"
WScript.Sleep (2000)
If MsgBox("До перезагрузки осталось меньше 5-ти минут."+ Chr(13)+ Chr(13)+"Для отмены перезагрузки нажмите ""Нет"" ", vbYesNo+vbExclamation+vbDefaultButton2, "Перезагрузка")=vbNo then
   WshShell.Run "shutdown -a"
end if

Answer 1

If you run the script yourself, it runs as a user and has access to the desktop.
In the scheduler you run it as system, how will it bring box to your desktop?
Run under the current user and you will be prompted.