Windows Update Restart Notification Registry Key

This guide outlines the specific Windows Registry key and values used to configure mandatory restart notification intervals for Windows Update. System administrators can customize these settings in the Registry Editor (regedit) to define how early and how frequently users receive warnings before an automatic update reboot occurs.

The Windows Update Registry Path

The configuration parameters for mandatory restart notifications are stored in the following Registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate

(Note: If this key or its subkeys do not exist, they can be created manually.)

Key Configuration Values

To control the notification intervals and mandatory reboot schedules, configure the following DWORD (32-bit) values under the WindowsUpdate key:

• SetRestartWarningSchd
  Enables the custom restart warning schedule.
  • Value Data: 1 (Enabled), 0 (Disabled)
• ScheduleRestartWarning
  Specifies the interval (in minutes) for the initial warning prompt before a scheduled restart.
  • Value Data (Decimal): Defines the reminder timer (e.g., 240 for 4 hours, 1440 for 24 hours).
• ScheduleImminentRestartWarning
  Specifies the interval (in minutes) for the final, imminent warning prompt before the system forcefully restarts.
  • Value Data (Decimal): Defines the countdown timer (e.g., 15 for a 15-minute persistent warning).

How to Configure via Regedit

1. Press Win + R, type regedit, and press Enter to open the Registry Editor.
2. Navigate to:
   HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
3. Right-click the WindowsUpdate key, select New > DWORD (32-bit) Value, and name it SetRestartWarningSchd. Set its value to 1.
4. Create another DWORD (32-bit) Value named ScheduleRestartWarning, choose the Decimal base, and enter your desired standard warning interval in minutes.
5. Create a third DWORD (32-bit) Value named ScheduleImminentRestartWarning, choose the Decimal base, and enter the imminent warning countdown in minutes.
6. Close the Registry Editor and restart the computer or restart the Windows Update service (wuauserv) for the changes to take effect.