why does my computer keep installing Windows Vista Service Pack 1 (KB936330) , over & over?

[System]

Windows Vista Service Pack 1 (KB936330)Installation date: ‎5/‎1/‎2013 7:07 PMInstallation status: CanceledError details: Code 8024000BUpdate type: ImportantWindows Vista Service Pack 1 (SP1) is an update to Windows Vista that addresses key feedback from our customers. Windows Vista SP1 addresses specific reliability and performance issues, supports new types of hardware and adds support for several emerging standards.
After you install this item, you will have to restart your computer.More information: http://technet.microsoft.com/en-us/windowsvista/bb738089More information: http://support.microsoft.com/kb/936330

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