If you are having trouble updating Windows through the auto update feature you can reset and reregister Windows Update Components. This usually solves Windows update related problems.
Microsoft has recently published a new automated ‘Fix it’ tool that resets Windows update components automatically. To do this, go to this page and click the ‘Fix it’ button or link to download the ‘Fix it’ installer. Run the downloaded installer file and then follow the steps in the Fix it wizard.