Windows 10 Cumulative Update Error 0x800f081f

Hello SayanSarkar95,

I'm Jin, a fellow Windows 10 user and an independent advisor.

I can see that you are getting an error: 0x800f081f while trying to install an update.

Here's a list of possible troubleshooting steps to help you fix the problem:

**Run the Windows Update troubleshooter.
You can refer to the link below on how to use the Windows Update troubleshooter:
https://support.microsoft.com/help/4027322

**Run Disk Clean up
Use Disk Clean up to remove delete temporary files that might be causing the update.
https://support.microsoft.com/help/4026616

**Download via Microsoft Update Catalog:
Manually download the update from Microsoft Update Catalog:
https://www.catalog.update.microsoft.com/
Select the exact update to download and install.

**Run SFC & DISM
Windows also has a built-in System File Check (SFC), kindly run SFC & DISM to fix any corrupted Windows System Files:
https://support.microsoft.com/help/4026529

**Clear Windows Update Cache & components:
1. Run Command Prompt as Administrator and enter the commands below:

Net Stop bits
Net Stop wuauserv
Net Stop appidsvc
Net Stop cryptsvc
Ren %systemroot%\SoftwareDistribution SoftwareDistribution.bak
Ren %systemroot%s\system32\catroot2 catroot2.bak
Net Start bits
Net Start wuauserv
Net Start appidsvc
Net Start cryptsvc

2. Restart your device and check if you'll be able to Update.

**Remove WUServer and WIStatusServer from registry.
1. Press Windows key + R, type regedit then hit Enter.
2. Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
3. Look for WUServer and WIStatusServer in the right pane.
4. If it's there delete them.

**Use the Update Assistant:
https://support.microsoft.com/help/3159635

**Advanced Startup
Use Advanced Startup as well to repair any Windows system files that might be causing for the update to fail.
1. Open Settings
2. Select Update & Security
3. Click the Recovery tab.
4. Look for Advanced Startup then hit Restart now.
5. Once restarted, click Troubleshoot > Advanced Options > Startup Repair.
6. Let it complete the process and see if Windows will be repaired.

**Repair Windows using an installation media:
As a last resort, use an installation media and use the Windows Repair feature to repair your copy of Windows.
https://www.microsoft.com/software-download/win...
1. Click the "Download tool now" button.
2. Once downloaded run the MediaCreationTool2004.exe file.
3. Accept the terms.
4. Select Create an installation media, then hit Next.
5. Proceed with the prompts.
Once the installation media is created, double click on the file then on the Windows Setup screen, click on Repair your computer.

I hope this helps.

Hello SayanSarkar95,

I'm Jin, a fellow Windows 10 user and an independent advisor.

I can see that you are getting an error: 0x800f081f while trying to install an update.

Here's a list of possible troubleshooting steps to help you fix the problem:

**Run the Windows Update troubleshooter.
You can refer to the link below on how to use the Windows Update troubleshooter:
https://support.microsoft.com/help/4027322

**Run Disk Clean up
Use Disk Clean up to remove delete temporary files that might be causing the update.
https://support.microsoft.com/help/4026616

**Download via Microsoft Update Catalog:
Manually download the update from Microsoft Update Catalog:
https://www.catalog.update.microsoft.com/
Select the exact update to download and install.

**Run SFC & DISM
Windows also has a built-in System File Check (SFC), kindly run SFC & DISM to fix any corrupted Windows System Files:
https://support.microsoft.com/help/4026529

**Clear Windows Update Cache & components:
1. Run Command Prompt as Administrator and enter the commands below:

Net Stop bits
Net Stop wuauserv
Net Stop appidsvc
Net Stop cryptsvc
Ren %systemroot%SoftwareDistribution SoftwareDistribution.bak
Ren %systemroot%system32catroot2 catroot2.bak
Net Start bits
Net Start wuauserv
Net Start appidsvc
Net Start cryptsvc

2. Restart your device and check if you'll be able to Update.

**Remove WUServer and WIStatusServer from registry.
1. Press Windows key + R, type regedit then hit Enter.
2. Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
3. Look for WUServer and WIStatusServer in the right pane.
4. If it's there delete them.

**Use the Update Assistant:
https://support.microsoft.com/help/3159635

**Advanced Startup
Use Advanced Startup as well to repair any Windows system files that might be causing for the update to fail.
1. Open Settings
2. Select Update & Security
3. Click the Recovery tab.
4. Look for Advanced Startup then hit Restart now.
5. Once restarted, click Troubleshoot > Advanced Options > Startup Repair.
6. Let it complete the process and see if Windows will be repaired.

**Repair Windows using an installation media:
As a last resort, use an installation media and use the Windows Repair feature to repair your copy of Windows.
https://www.microsoft.com/software-download/win...
1. Click the "Download tool now" button.
2. Once downloaded run the MediaCreationTool2004.exe file.
3. Accept the terms.
4. Select Create an installation media, then hit Next.
5. Proceed with the prompts.
Once the installation media is created, double click on the file then on the Windows Setup screen, click on Repair your computer.

I hope this helps.

Window Update Registry Keys Missing



HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
what to do now?

What worked for me was this 

**Use the Update Assistant:
https://support.microsoft.com/help/3159635

I've been trying to get the update to work forever, but after going through all the different steps from Suejin, finally, using the update assistant worked. And it was the easiest solution of all of those I've tried too. 

Update Assistant worked for me.

https://support.microsoft.com/en-us/topic/windows-10-update-assistant-3550dfb2-a015-7765-12ea-fba2ac36fb3f

I have been trying to fix this problems for several weeks. I am so glad I found this post.

Thank you very very much!

Something went wrong:

You can contact Microsoft support for help with this error. Here is the error code 0xa0000400.

Are there any other new steps for this issue as non of the mentioned helped?

I am having this issue for maybe 3 months and it's so annoying.. I can't even install other updates. It installs to 100% and then crashes by stopping other updates.

I just use 20H2 instead of 2004.