When manually downloading a Microsoft Security Update or hotfix for Windows 7 (Vista) you typically get a file with an MSU file extension. A file with an MSU extension is a Microsoft Update Standalone package. Microsoft Update Standalone Packages are installed through the Windows Update Standalone Installer WUSA.EXE which is located in the C:\Windows\system32 folder. [...]
Archive of posts filed under the Update category.
Troubleshooting Windows Update
Issues with installing Windows Updates? Then have a look at the following Microsoft Support Articles: KB971058 How do I reset Windows Update components? KB947821 Description of the System Update Readiness Tool for Windows Vista, for Windows Server 2008, for Windows 7, and for Windows Server 2008 R2
