If your PC repeatedly tries to install updates each time it's shut down, it's most likely because a Windows update has failed. Microsoft created the Downloads for Windows 7 because of an inconsistency in the Windows servicing store which may prevent the successful installation of updates, service packs, and software.
Download and install the Update Readiness Tool. When you run it, it will take a few minutes to check your PC and attempt to fix any problems preventing your updates from automatically installing. If the Update Readiness Tool is unable to fix the problem, you'll need to identify which updates are failing and manually install them.
To view your PC's updates, in Control Panel's System and Security group, select Windows Update. In Windows Update select View update history. In the update history window, check Status column. The updates should be indicated as Successful in the Status column.
You may need to scroll down to find the update that has failed. Look at the Name of the failed update, it should have a Knowledge Base number at the end. Go to the Microsoft Download Center and enter the Knowledge Base number in the search box. You will be taken to a page where you can download and install the update.
Some updates require that a previous update be installed successfully. The Knowledge Base download page will alert you to this. Use this process to fix any other failed updates. After all updates are successfully manually installed, automatic updates should be able to function properly.
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