Windows 7 - Error Code: 66a (Can't install KB2160841)

Question

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)

Installation date: ‎10/‎17/‎2010 2:14 PM

Installation status: Failed

Error details: Code 66A

Update type: Important

A security issue has been identified that could allow an attacker to compromise your Windows-based system that is running the Microsoft .NET Framework and gain complete control over it. You can help protect your computer by installing this update from Microsoft. After you install this item, you may have to restart your computer.

Answer 1

Frank's solution didn't work for me too.

But i solved it by uninstalling the .net framework extended and left the .net client on the server.

Update worked after that and the extended component came back with the latest updates.

Answer 2

See Andre.Ziegler reply to an earlier post involving the error:

http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_install/windows-update-error-0x8007066a-or-66a/d4fe1203-d165-4e41-9f02-27f079167b2c

Answer 3

had same problem,for a week,go to control panel click uninstall programs,find >Net framework 4 client profile file ,then click right and do repair file ,install part worked fine right after

Answer 4

Worked like a charm Frank.  And to think I spent nearly an hour with so called HP technical experts attempting to resolve this issue with nothing by failed results.

Answer 5

Thanks, Frank.  This worked like a charm for me.  The repair took quite awhile, I actually thought it got hung up...but it didn't and it did eventually finish the repair.  Then the update installed nicely.