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:
The System File Checker tool reports that there is a repair pending. This tool also reports that a restart is required.
This problem occurs when one of the processes that the "Symptoms" section describes is not completed successfully. This prevents other optional features from being turned on. This also prevents Windows updates, hotfixes, and language packs from being installed.
Restart the computer. Typically, when the computer restarts, Windows Vista tries to detect the problem. Then, Windows Vista tries to complete the installation of the component. Or, Windows Vista tries to roll back to the system state that existed before the component was installed. If this step is successful, go to step 4. If this step is not successful, go to step 2.
Use the Startup Repair tool.
For more information about how to use the Startup Repair tool, see the "Startup Repair: frequently asked questions" Help topic in Windows Vista. To do this, visit the following Microsoft Web site:
If this step is successful, go to step 4. If this step is not successful, go to step 3.
Use the System Repair tool to restore the computer to an earlier, valid restore point.
For more information about how to use the System Restore tool in Windows Vista, click the following article number to view the article in the Microsoft Knowledge Base:
How to repair the operating system and how to restore the operating system configuration to an earlier point in time in Windows Vista
Start Windows Update, and then install one update. By doing this, you confirm that Windows Update is working as expected. You also clear any temporary Setup files from previous installations. Temporary Setup files may have caused this issue to occur. To start Windows Update and install one update, follow these steps:
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, point to All Programs, and then click Windows Update.
Click to clear the check boxes for all the updates except one. Leave one check box selected.
Click Install Updates.
When the update is installed, restart the computer.
If you cannot start the computer after you follow these steps, search the Microsoft Knowledge Base for more information. Or, if you experience symptoms that differ from those that are described in the "Symptoms" section after you follow these steps, search the Microsoft Knowledge Base for more information. To search the Microsoft Knowledge Base, visit the following Microsoft Web site: