In Windows Vista and in Windows Server 2008, software updates use a new technology to install .msu files. To manually install .msu files in a Windows Vista or Windows Server 2008 environment, you must have the Wusa.exe tool installed. However, this tool returns a “1 (S_FALSE)” error code when either of the following conditions is true:

• You try to install a software update that is already installed on the computer.
• You try to install a software update that does not apply to the computer.

Description: When you run Wusa.exe together with the /quiet option to try to install certain software packages on a Windows Vista-based computer, the installation fails. Additionally, you do not receive an error message. This problem occurs with packages that contain a custom software license agreement. Keep reading →