Microsoft update would not install security update for Microsoft net. framework, version 1.1 Service

(KB928366)

Microsoft update would not install security update for Microsoft net. framework, version 1.1 Service Pack I?ies

This article MAY help: http://support.microsoft.com/kb/928366

if you have one of the issues.

Also, I had a similar problem (different Microsoft update) a while back with Microsoft Updates...turns out my anti-virus was prohibiting me from installing the update. I turned off the antivirus temporarily and it installed just fine. You may want to try that too.