The Icon in the task bar says updates are ready to install. I click on it and click install.
Cumulative Security Update for Internet Explorer 8 for Windows Vista (KB2559049)
Installation date: 9/17/2011 8:02 PM
Installation status: Failed
Error details: Code 800700C1
Update type: Important
Security issues have been identified that could allow an attacker to compromise a system that is running Microsoft Internet Explorer and gain control over it. You can help protect your system by installing this update from Microsoft. After you install this item, you may have to restart your computer.