Tech – for Everyone

Tech Tips and Tricks & Advice – written in plain English.

Fix Update Error 66A + Sunday Beauty 38

Shutting down for the night, I noticed that my 64-bit Vista machine had “Updates ready to install” for the 3rd night in a row.. which is a pretty good clue that at least one Update was failing to install.

So, I clicked on the Start button > All Programs > Windows Update > “View update history“.

Sure enough, in the “Status” column, I saw a “failed”.. on an Update named “Security Update for Microsoft .NET Framework 4 (KB2160841)” (also applies to KB2446708).

So to find out what the problem was, I right-clicked > “View details”. What I am looking for is the “error code”.

I saw that the code in this case is 66A. Clicking “Get help with this error” led to several ‘solution’ suggestions – too many. So I will tell you the one that works for me.

Step 1) Click Start > Control Panel > Programs and features.

Step 2) Scroll down until you find Microsoft .NET Framework 4 Client Profile, and click on it, once, to “select” it (turn it blue), then click the Uninstall/Change menu button (above list).

Step 3) A new window will open. Make sure the “Repair” radio button is selected, and press “next”. The automatic repair may take a few minutes to complete.

Step 4) Return to Windows Update (as per Step 1) and make sure that only the “Security Update for Microsoft .NET Framework 4 (KB2160841) is checked, and click “Retry” or “Install Updates”. Now the Update should succeed. If it doesn’t, get the “standalone” installer by clicking here and choose either 32 (x86) or 64 bit (x64) to match your system.

If that fails, I suggest calling Microsoft’s support number for free tech support (as this qualifies as a security issue) 1-866-PC-SAFETY.

Sunday Beauty XXXVIII

Click on image to see more by this artist

“Sunset view” by NeilsPhotography, courtesy of Flickr.

Copyright 2007-2011 © “Tech Paul” (Paul Eckstrom). All Rights Reserved.

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April 17, 2011 - Posted by | advice, computers, how to, Microsoft, PC, security, tech, troubleshooting, Vista, Windows 7


  1. So beautiful! Where are the words to describe such natural beauty… to do it justice that is?
    Thanks Paul



    Comment by Gaia | April 17, 2011 | Reply

    • Gaia,
      I am glad you like it. I thought today’s SB was an excellent photograph, both in the technical skill and the subject matter.

      I occasionally seek out such a scene – for two purposes: to remind myself that there really are “simple pleasures” to be had free of charge (if one slows down, and looks around), and as a “visual reminder” of some of my goals.
      I want to stand there see this in RL (“real life”) someday. (I’ll settle for somewhere very like that.. warm.)


      Comment by techpaul | April 17, 2011 | Reply

  2. Your tip about first repairing Net.Framework4 worked like a dream, after failed attempts at this particular update five nights in a row. Thanks so much.


    Comment by Susie | April 18, 2011 | Reply

    • Susie,
      Thank you for taking the time to let me know that my efforts here have been helpful.


      Comment by techpaul | April 18, 2011 | Reply

  3. Your tech tips on the error code 66a works!!!


    Comment by sherlyn | May 3, 2011 | Reply

    • sherlyn,
      Thank you for taking the time to let me know that you found my efforts here helpful.


      Comment by techpaul | May 3, 2011 | Reply

  4. Great site, beautiful picture!

    Did all of the above, downloaded from the standalone installer, worked like a dream! Many thanks!

    Identified the Net.Framework4 problem when troubleshooting to find cause for serious streaming slowdown. Perhaps you can help? All of a sudden video does not stream smoothly any more without constant buffering interruptions. Have been through all the typical disc clean-up, registry clean-up, defrag, history/pw/cookie dump, and still no improvement. Any ideas?


    Comment by Mads | May 17, 2011 | Reply

    • Mads,
      Sounds to me like you did the right things, so I cannot offer more (without looking at your machine) suggestions except:
      * Make sure your machine is ‘clean’ (no spyware or trojans). (I would start by visiting Trend Micro’s Housecall..)
      * Reboot your router
      * contact your ISP’s tech support
      (* if you are having troubles with just Netflix.. you can call them, too)


      Comment by techpaul | May 17, 2011 | Reply

      • Outstanding! Thank you for the fast response. I’ll try Housecall, etc. and let you know what happens.


        Comment by Mads | May 18, 2011 | Reply

  5. techpaul,
    HouseCall is a great new (to me) tool for my kit bag. Fortunately, no breaches. Looks like it turned out to be something as simple as router needing a reboot. But at least the machine got a spring cleaning! Thanks again –


    Comment by Mads | May 18, 2011 | Reply

    • Mads,

      (I love the ‘simple fix’.)


      Comment by techpaul | May 18, 2011 | Reply

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