Can't modify task "Reboot" in win10 home

Success. After much trying, this is what works for me on Windows 10 Home. Download PSExec.

PSEXEC /S CMD.EXE
SCHTASKS /Change /tn "\Microsoft\Windows\UpdateOrchestrator\Reboot" /DISABLE
You should get: SUCCESS: The parameters of scheduled task "\Microsoft\Windows\UpdateOrchestrator\Reboot" have been changed.

windows 10 home [...]

upset that there's some setting that I can't modify in my own computer ... I want to know why

You answer your own question. Home is for home users who do not necessarily have the capability to manage or maintain their systems. In locking home users out of some settings like this Microsoft are making some attempt to prevent the horrors of the XP era of unpatched systems where people have turned off updates because they don't understand why they need them and the implications of not getting them.

On to the guts of your question. S-1-5-18 is the LocalSystem user, this is a highly privileged account that normal users, even administrators, are not supposed to be able to interfere with on a day to day basis.

The idea is that we control windows through the userland tools and the operating system will make the necessary changes to the underlying processes that execute as system. Hence your inability to take control of the task you mention. The theory is that you don't change things here, you should be changing them in the graphical interface that you access through the usual settings window.

However there are tricks that you can use to bypass these protections.

To run with the privileges of SYSTEM you can do the following:

• Get a copy of PSEXEC from sysinternals
• Run the following in an Administrative CMD window
  • PSEXEC /S CMD.EXE

This will give you a command shell running as SYSTEM in session 0. From here you can execute commands as that user, meaning you will be able to change the function of those scheduled tasks

SCHTASKS /Change is your most likely option, from here you can take control of the tasks, stop, start, delete

I'm using Windows 10 Pro and was having a similar issue. I wasn't able to change my "Wake the computer to perform this task" setting on the reboot task using the task scheduler UI, but found I eventually could using this method:

Using psexec as Patrick suggested:

1. Run a command prompt as administrator.
2. Navigate to where the psexec executable is located.
3. Run .\psexec -s -i cmd.exe to open a new cmd window.
4. In the new cmd window run taskschd.msc (or %windir%\system32\taskschd.msc).
5. Edit your task like before. You shouldn't be prompted for credentials.

I started looking for a solution for this when Windows would wake my computer from sleep to force a reboot. The problem is my bootloader pins the CPU at 100% while it waits for my input. My laptop is often closed when this happens and it becomes hot to the touch. I'm worried for my desktop too, which hasn't been acting normal since I started finding it sitting at the bootloader in the morning, with all the fans on.