Windows Vista updates which will not install

My OS Vista Home Premium 32 - bit for my HP Pavilion a6460t computer will not install the updates listed below.  I scanned for virus conficker, as well as for other viruses, most recently with the Microsoft OneCare security scan (beta), and my computer is not infected according to these analyses.  I have also tried installing these updates directly from the websites of download from Microsoft without success ("the following updates were not installed").  Auto update is on.

Update security for Windows Vista (KB960225)
Update security for Windows Vista (KB958690)
Update for Windows Vista (KB959772)
Update definition for Windows Defender - KB915597 (definition 1.55.1119.0)
Update for Windows Mail Junk e-mail filter [March 2009] (KB905866)

Thank you

Ron Alexander

After several calls to the technical support of HP (which is also the warranty service for my Vista installed factory), the problem of update is finally resolved by reinstalling the operating system Vista.  Thanks again for all your help and suggestions.

Ron Alexander

Tags: Windows

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