Article ID: 931265 - View products that this article applies to.
Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/256986/ )Description of the Microsoft Windows registry
Consider the following scenario:
When the WSUS client computer restarts automatically, you will see the entries that resemble the following in the %windir%\WindowsUpdate log file:
FATAL: MSI DLL version is 2.0. Version 3.1 is required.
This issue occurs because the updates that are deployed on the WSUS client computers require that Microsoft Windows Installer 3.1 is present on the WSUS client computers.
If Windows Installer 3.1 is not present on the WSUS client computers, Windows Installer 3.1 is downloaded from the WSUS server and installed on the WSUS client computers, regardless of the WSUS server approval status.
Installation of Windows Installer 3.1 on the WSUS client computers causes the WSUS client computers to restart because a restart is required for Windows Installer 3.1 to function correctly.
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
To resolve this issue, follow these steps on the WSUS client computers: