SOLVED! Windows Update Error 80004004-40019

Windows 10 is well-known for its user-friendly interface which is no surprise as it is designed to ensure convenience. Needless to say, more and more Windows users who use old versions of Windows (7, 8, etc) decide to update to Windows 10 every day. In most cases, it won’t take a lot of work to update to Windows 10. Still, the process is not always smooth-sailing and Windows Update error 80004004-40019 is a prime example.

Causes Of The Error

Rollback Registry Key

All in all, the Rollback Registry key can complicate the update of the OS on occasions. On the bright side, if the Rollback Registry key is responsible for Windows Update error 80004004-40019, there is no need to do much. 


As time passes by, it’s not uncommon for Windows Update service cache to be full of used and obsolete files. Unless Windows users take action, the cache of Windows Update service would get in the way of updates. 

Corrupted System Files

Following multiple updates, some of the Windows system files may become corrupted files which disrupt the performance of features. Hence, once it comes to  Windows Update error 80004004-40019, you should think about corruption in the system files. 


Delete Rollback Registry Key

By Deleting the Rollback key via Registry Editor, there is a good chance that you could get rid of the Windows Update error 80004004-40019. To do so go through the steps down below: 

  • Step 1: Press Windows + R to open Run.
  • Step 2: Type regedit then press Enter.
  • Step 3: Look to the left of the Registry Editor and go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\OSUpgrade\Rollback.
  • Step 4: Right-click Rollback key and pick Delete.
  • Step 5: Close Registry Editor, restart your computer and update your PC again when the screen comes back on. 

Refresh The Windows Update Service

In case you don’t know, you could reset Windows Update service to eliminate problems, especially those that involve the cache. 

Stop Windows Update 

  • Step 1: Hit the Windows key.
  • Step 2: Type services.msc then press Enter.
  • Step 2: In Services, search for Windows Update, right-click it and pick Stop.

Clear The Windows Update Cache Memory

  • Step 1: Press Windows + R to open Run.
  • Step 2: Type %windir%\SoftwareDistribution\DataStore then press Enter.
  • Step 3: Press Ctrl + A to select all the files in the DataStore folder and hit Delete.

Restart Windows Update 

  • Step 1: Return to Services.
  • Step 2: Look for Windows Update.
  • Step 3: Right-click Windows Update and select Start.

System File Checker (SFC) 

For your information, System File Checker (SFC) is a utility that analyzes Windows files for signs of corruption and fixes them. Hence, by taking advantage of SFC, you should be able to tackle issues like Windows Update error 80004004-40019 with relative ease. 

  • Step 1: Go to Search bar, type cmd, right-click Command Prompt and pick Run as administrator. If prompted, enter the Administrator password then hit OK.
  • Step 2: In Command Prompt (Admin), type sfc/scannow and press Enter.
  • Step 3: Wait for the scan to wrap up. Last but not least, restart your computer and update Windows again.


  • Create a Recovery Drive and put it somewhere safe before you update your computer. That drive will serve as a contingency in case errors pop up during the update process and ruin your computer.
  • Always keep the Windows Product Key close by as you update OS. It’s highly likely that the system will request you to enter the key to reactivate Windows once the process concludes.
  • Backup your important data before updating to Windows 10 as the risk of losing files and folders due to errors is always present.
  • If a new Windows update is available and you want to initiate the update integration, feel free to click Restart now.
  • Ensure that your computer has enough free space before updating to a new operating system. Lack of capacity to accommodate the operating system in its entirety would lead to all sorts of hassles during update.

What Happens If I Turn Off The PC When The Update Process Is Halfway Done?

If you interrupt Windows updates by switching off your computer, the update process will resume the moment the PC is back on. Still, you should avoid turning off your PC when it is updating to avoid corrupting files of the update.

Is It Necessary To Update Windows?

Windows updates play a key role in computer operations because they improve programs, boost security and enhance the performance of features. Because of that, you should update your Windows PC from time to time. 

Can Windows Update Mess Up My PC?

On occasions, yes. Some updates may cause a number of problems including stuttering, drops in frame rates and, in extreme cases, the blue screen of death (BSOD). 

How Often Should I Perform An Update?

It is good to check for updates once a month.


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