Security Update for Microsoft .NET Framework 4 HELP

Security Update for Microsoft .NET Framework 4 on XP, Server 2003, Vista, Windows 7, Server 2008 x86 (KB2789642)Download size: 4.2 MBYou may need to restart your computer for this update to take effect.Update type: ImportantA security issue has been identified that could allow an unauthenticated remote attacker to compromise your system and gain control over it. You can help protect your system by installing this update from Microsoft. After you install this update, you may have

to restart your system.More information: http://go.microsoft.com/fwlink/?LinkID=273905Help and Support: http://support.microsoft.comPlease can some one tell me why this update keeps saying install when i do it says succesfull then 10mins later it is asking me to install the same update this has been going on for 1 week HELP Please

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