Recurrent failure of attempts to install KB973702, KB974811, KB974556 and new updates. Error Code 646 _

Chronology of the problem

(1) click on install available updates, KB974811, KB974556 and KB973702.

(2) State reached installation update 3 of 3 bar.

(3) result = "failure: 3 updates.»  Code 646 Windows update has encountered an unknown error.

(4) the yellow shield identifies the availability of these specific updates 3 remains on the start menu.

My edition of Windows is Windows Vista Home Premium - ServicePack 2 and it is a 32-bit operating system

All I had to do was manually download and install; problem solved!

Tags: Windows

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