WindowsUpdate 80070666 error in Microsoft Update or Security Essentials

Updates repeatedly fail for the last week or so. Automated fix solutions have not helped. 

Hi arthro,

1.        Which updates are you not able to install?

2.        Did you make any software or hardware changes on your computer prior to this issue?

Let’s follow these methods & check if the issue persists:

Method 1

You may reset the Windows Update components, by downloading the Microsoft ‘Fix-it’ tool from the link:
 How do I reset Windows Update components?

Method 2

a) You may configure the computer in clean boot state. It will start Windows 7 by using a minimal set of drivers and startup programs and helps to eliminate software conflicts.

The following link has steps showing how to perform clean boot:

Note: Please ensure that the computer is set to start as usual by following the step 7 from the article: How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows7:

b) Thereafter, manually download & install the update from the Microsoft Download Center.

Hope the information helps.

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Question Info

Last updated July 18, 2018 Views 1,631 Applies to: