How to Fix Error code 0x801901f5 in Windows 10

While downloading cumulative updates of Windows 10, several users suddenly receive the failed message displaying the “error code 0x801901F5”. In this situation, the task abruptly exits and prompts the Blue Screen on the desktop. You may notice a system crash and PC starts rebooting continuously but never brings up the Login Screen. In this guide, we explain the underlying causes behind this along with some easy workarounds that can troubleshoot this bug.

There are a variety of factors that act as the potential reasons and prevents updating Windows 10 OS. The corrupt system files, incompetent apps, third-party antivirus, missing entries inside Registry are some prime reasons behind this issue. A few Windows services not working properly, stored unnecessary cache, an obsolete device driver may also result in Error code 0x801901F5. To fix this, Run the update Troubleshooter, try disabling the third-party anti-malware program, or disable Windows Defender Firewall. If the above tricks don’t work, Reset Mail & Calendar app, restart Windows Services, clear stored cache may diagnose the cause and resolve the same. 

Fix Error code 0x801901f5 in Windows 10

To fix the Error code 0x801901f5 on Windows 10 PC, follow these workarounds –

1} Run Windows Update Troubleshooter

The Windows troubleshooter is the basic tool to resolve common bugs related to updates. Here are the steps to work upon –

  • Open Settings (Win & I).
  • Select Update & Security category.
  • Tap Troubleshoot on the left column.
  • Switch to right-pane and hit Windows Update then Run the troubleshooter.

Run the troubleshooter

  • Follow the on-screen instructions to complete the remaining process.

Now go to the Windows Update section again and install the pending updates (if available any).

2} Uninstall Third-party anti-malware program

The antivirus program may sometimes identify Windows installer files as malware, block them thus prompting 0x801901f5 error. To solve this Windows activation issue, uninstall the existing third-party anti-malware. You may install Windows Defender (default) instead as well. Follow the below guidelines to do this –

  1. Right-click on Start and select the Gear icon (Settings).
  2. Select App then move to the Apps & features section.
  3. Switch to the right-hand side, scroll down and locate third-party antivirus app.
  4. When found, select the same and hit the Uninstall button.
  5. On the confirmation dialog, select Uninstall again.

Do Restart the system after removing the anti-malware program so as to save the current configuration.

3} Turn off Windows Firewall Temporarily

The other possible reason that could lead to the Error code 0x801901f5 while updating patches is Enabled Windows Firewall. The right approach would then be is to disable this tool temporarily and try updating the Windows OS. Here is the complete procedure –

  • Press Windows key and R together to launch the Run dialog.
  • Type Firewall.cpl near the blinking cursor then tap the OK button.
  • Next, click Windows Defender Firewall on or off available at the left pane.

Disable Windows Firewall

  • Select Turn off windows firewall (not recommended) radio button under both Private as well as Public network settings.

Error code 0x801901f5

  • At last, hit OK to confirm the changes.

You may now update the existing Windows 10 OS.

Note: There is no need to “turn On” the Windows Firewall manually as this happens automatically after the next reboot of PC.

4} Reset the Mail and Calendar

If you are still getting the Error code 0x801901f5 while updating Windows, try resetting the mail and calendar app as the diagnostic tool. To do so, perform these steps –

  • Press Win & X hotkey altogether and select Settings from the Power menu.
  • Here, click the Apps category.
  • Move to the right pane under Apps & feature section and select the Mail and Calendar.
  • Now go to the Advanced options link.

Error code 0x801901f5

  • Scroll down and tap the Reset button.

Reset Mail and Calendar appa

On the confirmation dialog, press Reset again to confirm the subsequent changes. 

5} Clear the Windows Store cache

Sometimes the presence of cache in the Windows Store may arise the update error 0x801901f5 on PC. If that’s the case, you need to clear such files using the following steps –

  • Click on the Search icon and type wsreset.exe in the text bar.
  • Hit Enter to let the process begin and wait till the task gets completed.

Error code 0x801901f5

  • Once over, update the existing operating system.

6} Update the device driver

The presence of an outdated or corrupt device driver may also cause error 0x801901f5 while updating. To manage such errors, identify the obsolete driver and update the same to its latest version using these steps –

  • Right-click on Start and select the Device Manager.
  • Expand each section one by one and locate the outdated driver.

Note: The yellow exclamation mark next to a device driver represents the faulty one.

  • Now do the right-click and choose Update driver using the context menu.

Update driver

  • Next, choose the first option “Search automatically for updated driver software“.
  • This will look for any updates available for the specific driver offline as well as online and update the same.

Note: Make sure you have a stable internet connection to update the corrupt driver.

  • Once finished, Restart your system and see the improvements.

7} Uninstall the problematic application

The presence of corrupt apps or their leftover files may also trigger the update error 0x801901f5 on Windows 10. Hence, you must find such applications and remove them from your system. Here are the steps to follow –

  • In the search text box, type Control Panel and hit Enter.
  • Go to the Programs and Features category.
  • From the installed list, select the recently installed program.
  • Tap the Uninstall button visiting the top ribbon.

Error code 0x801901f5

  • Press Uninstall on the confirmation dialog.

Once completed, close all running tabs and Restart your system so that changes made so far come into effect.

8} Restart Windows Update Services

In certain cases, the Windows Update services start malfunctioning that in turn restricts installing patches. If that’s the case, you must reset this tool and set it as Automatic. Here are the essential steps to follow –

  • Press Win and S shortcut to launch Search.
  • Type services.msc near the text field and press Enter.
  • On the Services wizard, locate the Windows Update.
  • Now do the right-click on this key and select Properties.

Error code 0x801901f5

  • Afterward, choose Automatic under Startup Type.
  • Henceforth, check its running status as Stopped then tap OK to confirm the changes.

Error code 0x801901f5

  • Close all of the running applications and Restart your computer.

You may no longer receive the error code 0x801901f5 on your PC.

9} Delete certain keys using Registry Tweaks

The existence of a few Key values inside the registry may also prevent Windows from updating. This is why we suggest deleting such entries using the below steps –

  • Press Window and R shortcut to open the Run dialog.
  • Type regedit then hit OK to launch the registry editor.
  • If UAC prompts, tap Yes.
  • Now browse to the following path –
HKEY _ LOCAL _ MACHINE \ SOFTWARE \ POLICIES \ MICROSOFT \ WINDOWS\ WINDOWS UPDATES \ AU
  • Next, right-click on the AU folder and select the delete option.

Error code 0x801901f5

  • If any confirmation window appears, hit OK.
  • Close all running windows and Reboot the PC.

We hope, this guide helps to resolve the Update error code 0x801901f5 on your system.