why I can not install Security Update for Microsoft.NET Framework, Version 2.0 (KB928365) ?
MEDA asked:
Why I can not install Security Update for Microsoft .NET Framework, Version 2.0 (KB928365) ?? This is only update which keep failing to be updated..what is wrong with my computer system? what do I need to change ?
Why I can not install Security Update for Microsoft .NET Framework, Version 2.0 (KB928365) ?? This is only update which keep failing to be updated..what is wrong with my computer system? what do I need to change ?

This is getting to be a well-known problem. The cause seems to be that one of your previous .NET installations was damaged in some way. To get around it is quite a bit of work, uninstalling and reinstalling most .NET versions.
Here’s the MS knowledge base article:
There are also some forum posts with additional information. Just search the web for “KB928365″.