Fail Update Win 7 Code Error 643

Recently i was a problem with windows update about Security Update for Microsoft .NET Framework 4 on XP, Server 2003, Vista, Windows 7, Server 2008 x86 (KB2835393), update always fail ! i got some notification Error found code 643 : tray again...! i have tried many times, and get the same result. then i try to searching in google and i get some solution, one of them are with repairing Microsoft .NET Framework 4 Client Profile, because failure is usually due to Microsoft .NET Framework 4 Client Profile is corrupt, so we have to fix it first. if step the update still to failure, we must download Microsoft .NET Framework 4 Client Profile from http://www.microsoft.com/en-us/download/details.aspx?id=17113, then open Microsoft. NET Framework 4 Client Profile downloaded, follow the instructions and select repair and wait until finished, then restart the PC, and update Security Update for Microsoft .NET Framework 4 on XP, Server 2003, Vista, Windows 7, Server 2008 x86 (KB2835393) again. I have tried and working. Error found code 643 does not appear anymore.