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In Windows Vista, the Windows Update agent may not follow the "Re-prompt for restart with scheduled installations" Group Policy setting. This issue occurs when you have configured Windows Update to automatically install hotfixes at a certain time, and you do not restart the computer.
After the hotfixes are installed, a defined delay occurs before the first prompt to restart the computer. However, a design change in the Windows Update agent now requires that the user select the defined delay value from a drop-down list.For example, the user may select values of 10 minutes, 1 hour, or 4 hours. The default delay value is 10 minutes.
The delay value that the user selects determines how much time the Windows Update agent will delay until the next prompt to restart the computer.
The "Re-prompt for restart with scheduled installations" Group Policy setting specifies how much time Automatic Updates waits before prompting the user again for a scheduled restart.
If the status is set to Enabled, a scheduled restart will occur after the specified number of minutes has elapsed since the previous prompt for restart.
By default, if the status is set to Disabled or to Not Configured, the interval is 10 minutes.
The "Re-prompt for restart with scheduled installations" Group Policy setting is in the following location:
Windows Vista Business, Windows Vista Enterprise, Windows Vista Home Basic, Windows Vista Home Premium, Windows Vista Ultimate, Windows Vista Business 64-bit Edition, Windows Vista Enterprise 64-bit Edition, Windows Vista Home Basic 64-bit Edition, Windows Vista Home Premium 64-bit Edition, Windows Vista Ultimate 64-bit Edition