How to disable Windows 11 automatic reboots?

for /f "tokens=*" %%a in ('powershell "(Get-Date).Hour"') do set startHour=%%a

set /a "endHour=(%starthour%+18)%%24"

reg add HKLM\SOFTWARE\Microsoft\WindowsUpdate\UX\Settings /v ActiveHoursStart /t REG_DWORD /d %startHour% /f

reg add HKLM\SOFTWARE\Microsoft\WindowsUpdate\UX\Settings /v ActiveHoursEnd /t REG_DWORD /d %endHour% /f

There should be no modulus in the first line. Powershell ALWAYS returns a 24 hour integer for the command (Get-Date).Hour. If it's 5:00 in morning or 5:59, it returns 5. If it's 3:29 PM, it returns 15.

The second line adds 18 hours and uses modulus to ensure the time wraps at midnight, so ( 15 [3PM] + 18 ) % 24 = 33 % 24 = 9 [AM].

Run it at 12 PM and 12 AM... or 9AM and 9PM... you'll always have 6 hour overlap. It's infallible.

The +18 in the first line comes to -6 when you do the modulo 24 hour logic. That is just to make sure that the start is well and truly in the past just in case there is ambiguity about which minute of the hour it is and when the hour starts.

This is brilliant... rolling the active hours... but I don't quite get your logic. The active hours are the hours in which Windows CANNOT reboot. So you want to set the START hour to the current hour. And set the END hour 18 hours in the future. This means it can't reboot during the current 18 hour window.

for /f %%i in ('powershell "((get-date).Hour) %% 24"') do set startHour=%%i

for /f %%i in ('powershell "((get-date).Hour+18) %% 24"') do set endHour=%%i

DON'T add hours for the first line. Add 18 to the second line (endHour). Then run the task every 12 hours. No need to run every hour.

For less savvy users... when scheduling in Task Scheduler... schedule the task "On a schedule"... "One Time" to run at NOON... and then "Repeat task every" 12 Hours... Indefinitely. In the task Settings tab, "Run task as soon as possible after a scheduled start is missed". On the General tab, have it run if logged on or not and store an admin password, Run with highest privileges, and mark as Hidden.

Note that this script depends on you having your clock settings enabled for 24 hour clock format (i.e. 2pm is 1400). I know this is typically the default for Europe and non-US, but the default recommended settings in the US will be the 12hr format. The script will make incorrect assumptions/calculations with 12 hr format (e.g. when running batch file at 4pm, it set active time 2200 start and 1000 end time, which would make Microsoft think it 6 whole hours where it could initiate a restart, since I ran the batch file at 4:12pm !)

Simple fix - just change your clock to 24hr format and works fine.

This solution really works. Everybody can follow the instructions. I notice today. windows have a restart required e did not reboot for itself. I need to press restart to do id. thanks a lot for the solution.

After several updates, and no AUTO RESTART WITHOUT MY PERMISSION, the solution really works,

post a copy bellow,

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https://www.minitool.com/backup-tips/windows-11-random-restart.html

Step 1: Ge the Run dialog by pressing Win + R, type regedit, and click OK to launch Registry Editor.

Step 2: Click Yes to grant admin access in the pop-up window.

Step 3: Go to the path – Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows.

Step 4: Right-click on the Windows folder and choose New > Key. Name it as Windows Update.

Step 5: Right-click on Windows Update and select New > Key. Name the new key as AU.

Step 6: Click on the newly created key, right-click on the empty space and choose New > DWORD (32-bit Value). Name it as NoAutoRebootWithLoggedOnUser.

Step 7: Double-click on the new item, set Base to Hexadecimal, set Value data to 1, and click OK to save the modification.

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this reg key really solve the problem. Do not need to wait for microsoft solve the problem.