Dec 292010
 

Problem

You might receive “Error code 0000066A Windows Update encountered an unknown error” when Windows Update fails to install: 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).

Solution 1

Use the following steps to fix this issue

1.Go to Program and Features, click it. and Scroll down to Microsoft.Net Framework 4 Client Profile, right click it.

2.It will give you a choice of Uninstall/Change, click it.

3.Then, it will give a choice to Repair it, pick Repair   it.  It will take about 4-10 minutes to repair (with my PC) your experience may vary.

4.When completed, go to your update center, and update it again.

Solution 2

Remove Microsoft .Net Framework 4.0 with the .NET Framework Cleanup tool reinstall the Microsoft .Net Framework 4.0 and install the Update.

You can download .NET framework cleanup tool from here

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 Posted by at 11:47 am

  2 Responses to “How to fix Error code 0000066A Windows Update encountered an unknown error in windows 7”

  1. my comment is about error 0000066a i just follow the steps to fix it and thats it. thank u very much, it works just fine, awesome

  2. Solution #1 worked fine for me. Thanks! Got rid of the 0000066A WindowsUpdate Error on a Vista Ultimate 64.

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