Error: We couldn’t complete the updates, Undoing changes. Don’t turn off your computer.

Hi Ahmad,

Thank You for the update on the issue. The KB3048778 is not the error code, it is the Knowledge Base ID of the update in Windows 8.1 that you are trying to install.

This issue may arise when there are issues with the Windows update components. Try the following methods to fix the issue.

Method 1: Run the Windows Update Troubleshooter

Try to run the Windows update troubleshooter, it will detect and resolve the most common issues with the Windows updates. To do so, follow the link below. You may also follow some other common solutions on the same articles.

https://support.microsoft.com/en-us/gp/windows-update-issues

Method 2: Reset Windows Update components

If the issue is with the Windows update components, this method will resolve the issue by repairing all the components associated with it. Click on the link below and follow the article on the same.

How do I reset Windows Update Components?

https://support.microsoft.com/en-us/kb/971058

To do so: Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

*How to back up and restore the registry in Windows*

Method 3: Clean Boot

A clean boot is performed to start Windows by using a minimal set of drivers and startup programs. This helps eliminate software conflicts that occur when you install a program or an update or when you run a program in Windows. To know more, follow the article below:

http://support.microsoft.com/kb/929135

Note: After troubleshooting, refer to this section ‘How to reset the computer to start normally after clean boot troubleshooting’.

Let us know the results once you have tried these steps.

Thank You

This error may appear anytime a Windows Update fails. To investigate possible solutions, we need to start with the specific error code.

We can do this by viewing your update history.

1. Swipe in from the right edge of the screen (or, if you're using a mouse, pointing to the lower-right corner of the screen and moving the mouse pointer up), and tap or click Settings.
2. Tap or click Change PC settings, and then Update and recovery.
3. Tap or click View your update history.

View failed update error code.

Please post here with your error code, so that the Community can try to help guide you appropriately.

Hi, when I update windows 8.1 , this is the error code I get  KB3048778.

do I just wait for the undoing changes don't turn off your computer to finish?

After many days and nights of struggle, and after trying many solutions offered here, I finally got through to someone on chat at Microsoft who arranged for me to talk to a live human -- who then took over my computer remotely and fixed it. He uninstalled then reinstalled Windows 8.1 There is now a desktop icon that is labled "reset" and another one called "windows" that he put there.  Now my updates install smoothly.

here was my problem and how I fixed it

In my case, kb3000850 and 8 other updates were continually being installed and reverted.

  second point, stating kb3000850 is optional was not the case for me, it was listed as critical.

For those reasons I did not hide the update.

I read through many other posts related to kb3000850 and found that in some cases having Avast av possibly contributed to the failure(s).

I disabled the three Avast shields, activated Windows Defender. (I did not remove Avast).

I restarted the computer, the updates reinstalled and reverted again. I shutdown the computer again and on this restart all 9 updates installed.

I will leave Avast disabled until several more windows updates apply correctly and then decide whether I'm safe enough with Defender.

Good luck to others who persist in getting beyond this nightmare