"This system does not have required products" error message when you install Windows SharePoint Services Service Pack 1

When you try to upgrade Microsoft Windows SharePoint Services to Microsoft Windows SharePoint Services Service Pack 1 (SP1), you may receive the following error message:

This issue may occur if the language of Windows SharePoint Services SP1 that you are installing is different from the language of the original release version of Windows SharePoint Services that is installed on the server. For example, this issue may occur if you try to install the English version of Windows SharePoint Services SP1 on a server that is running the Japanese version of the original release version of Windows SharePoint Services.

To resolve this issue, make sure that the language of Windows SharePoint Services SP1 that you install is the same as the language of the original release version of Windows SharePoint Services that is installed on the server.

For more information about Windows SharePoint Services, visit the following Microsoft Web site: