How to Fix Windows Update Error 80070666

Aug. 13, 2018 / Updated by Bessie Shaw to Windows 10

Are you bothered by the Windows update error 80070666 recently? This error code has been reported before. A number of users encountered this error after they installed the Update for Microsoft Security Essentials KB2310138 on Windows 7. There are many causes for the appearance of the Windows update error code 80070666. And it is commonly caused by the corrupted Windows operating system. If you are struggling with this error, this post will do you a favor. Several workarounds are described below for your reference.

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First of all, to troubleshoot Windows update error 80070666, the easiest way is to reboot your computer. Sometimes the issue will disappear after you reboot the computer.

Workaround 1. Run Windows Update Troubleshooter

To troubleshoot the update error code 80070666, the first workaround is to run Windows Update troubleshooter. Do as follows:

Step 1. Type “troubleshoot” in the search bar and then click on Troubleshoot in the search result to launch it.

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Step 2. Locate Windows Update and click it.

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Step 3. Click on Run the troubleshooter. The troubleshooter will detect the issues and fix them automatically.

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Workaround 2. Run a Clean Boot to Resolve Update Error 80070666

If the error still exists after you run the Windows Update troubleshooter, it may need a clean boot to give your computer a fresh start.

Refer to this post: How to Use Windows 10 Clean Boot to Fix PC Errors.

Workaround 3. Reset the Software Distribution Folder

This is a common and widely used solution to resolve Windows update issues. Before you reset the Software Distribution Folder, you’d better remove all the files in it. Take the following steps.

Step 1. Press shortcut key Windows + R to open the Run dialog box. Then type “services.msc” in it and hit Enter to run it.

Step 2. Find Background Intelligent Transfer Service and right click it to select Stop.

Step 3. Find Windows Update and also right click it to select Stop.

Step 4. Launch File Explorer and navigate to C:\Windows\SoftwareDistribution. Then remove all the files in it.

Step 5. Press Windows + X and click Windows PowerShell (Admin) to launch the Windows PowerShell.

Step 6. Run the following commands one by one to reset the Software Distribution folder:

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