Consider the following scenario. On a Windows Vista-based computer, you try to turn on an optional feature. Or, you try to install a Windows update, a hotfix, or a language pack. However, the process is interrupted because of a power failure or because the computer stops responding. After the interruption, you experience one or more of the following symptoms:

• You cannot turn on an optional feature, install a Windows update, install a hotfix, or install a language pack.
• If you click to select the Turn Windows Features on or off check box in the Programs and Features item in Control Panel, the Software Explorer list is empty.
• The Windows Vista Language Pack Setup tool (LPKSetup.exe) indicates that no additional language packs can be installed until you restart the computer.
• When you run the Windows Optional Component Setup tool (OCSetup.exe), you receive the following error code:
  

  65535 (Unexpected)

• The System File Checker tool reports that there is a repair pending. This tool also reports that a restart is required.
• The computer does not start.