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Microsoft Windows 7



Q: Getting error code 66A Windows update encountered an unknown error. Security Update for .NET Framework 4 on Windows XP, Windows Server 2003, Windows Vista, Windows 7, Windows Server 2008, Windows Server 2008 R2 for x64-based Systems (KB2160841)

A: Windows 7 – Error Code: 66a (Can’t install KB2160841).
Control panel -> Uninstall Programs, Repair .Net framework 4 client profile. Install the update again.

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