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 to 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.