I can't install Security Update for Microsoft .NET Framework 4 on XP, Server 2003, Vista, Windows 7,

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After failing to install Microsoft .NET Framework 4 on XP, Server 2003, Vista, Windows 7, Server 2008 x86 (KB2789642) twice, it was successfully installed. However, Windows Update tried to install it again and failed twice. In the third try, it was successful
again. Then Windows Update tried to install it for the third time. Since then, it has failed 9 times, and it is trying to install it.I tried everything Windows Help suggested, but I can't help Windows Update to install this update.

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