How to fix securityhealth\10.0.29510.1001-0\securityhealthsso.dll error

Question

How to fix securityhealth\10.0.29510.1001-0\securityhealthsso.dll error

Daniel 15

I had a few system crashes tweaking my RAM on a new computer, and ended up with this error code appearing at each system restart now...

C:\Windows\System32\SecurityHealth\10.0.29510.1001-0\SecurityHealthSSO.dll is either not designed to run on windows or it contains an error.

It ends with Error Status 0xc000012f

I did a search online, and tried methods to correct, but it seems that I need a copy of the file to replace the corrupted version. Can anyone provide a copy with instructions to replace?

Thank you!

Khalil 40 Reputation points

2026-02-14T09:57:01.1866667+00:00

I updated the system to version KB5074828 and KB5077181 on the 11th. I did nothing else after that. Today, when I started the computer normally, this problem occurred. I'm not sure if it's related to the system update, but I've tried almost all the solutions online and none of them worked. I hope I can get an effective solution here...

6 answers

Your answer

Khalil 40 Reputation points

2026-02-14T09:57:01.1866667+00:00

I updated the system to version KB5074828 and KB5077181 on the 11th. I did nothing else after that. Today, when I started the computer normally, this problem occurred. I'm not sure if it's related to the system update, but I've tried almost all the solutions online and none of them worked. I hope I can get an effective solution here...

Answer 1

Ramesh Srinivasan 81,185 Independent Advisor

After completing the earlier steps, please run the following file:

C:\Windows\System32\SecurityHealth\10.0.29510.1001-0\Microsoft.SecHealthUI_8wekyb3d8bbwe.appx

Click "Reinstall".

0 comments

Answer 2

Ramesh Srinivasan 81,185 Independent Advisor

From PowerShell admin, please run these commands to check the status of the Microsoft Defender services:

Start-Service -Name windefend, securityhealthservice, wscsvc -Verbose

gsv windefend, securityhealthservice, wscsvc | select Name, StartType, Status | ft -auto

Post the output.

Daniel 15 Reputation points

2026-02-14T09:26:18.08+00:00
PS C:\Users\odhan> Start-Service -Name windefend, securityhealthservice, wscsvc -Verbose

VERBOSE: Performing the operation "Start-Service" on target "Windows Security Service (securityhealthservice)".

Start-Service : Failed to start service 'Windows Security Service (securityhealthservice)'.

At line:1 char:1

Start-Service -Name windefend, securityhealthservice, wscsvc -Verbose

+ CategoryInfo : OpenError: (System.ServiceProcess.ServiceController:ServiceController) [Start-Service], ServiceCommandException + FullyQualifiedErrorId : StartServiceFailed,Microsoft.PowerShell.Commands.StartServiceCommand

VERBOSE: Performing the operation "Start-Service" on target "Microsoft Defender Antivirus Service (windefend)".

VERBOSE: Performing the operation "Start-Service" on target "Security Center (wscsvc)".

PS C:\Users\odhan> gsv windefend, securityhealthservice, wscsvc | select Name, StartType, Status | ft -auto

Name StartType Status

securityhealthservice Manual Stopped

windefend Automatic Running

wscsvc Automatic Running
Daniel 15 Reputation points

2026-02-14T09:26:39.0466667+00:00

accidentally posted it twice, removed one
Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T09:38:49.4+00:00
One of those services is failing to start.

I'd suggest running the following command from a TrustedInstaller Command Prompt.

You can open a TrustedInstaller Command Prompt using AdvancedRun, portable freeware from Nirsoft.net.

In the TrustedInstaller Command Prompt, run these commands:

C:\Windows\System32\SecurityHealth\SecurityHealthSetup.exe" "C:\WINDOWS\system32\SecurityHealth\10.0.29510.1001-0" cd /d C:\WINDOWS\system32\SecurityHealth\10.0.29510.1001-0 regsvr32 /u SecurityHealthProxyStub.dll regsvr32 /u SecurityHealthAgent.dll regsvr32 SecurityHealthProxyStub.dll regsvr32 SecurityHealthAgent.dll

Note:

The above commands won't be effective when run from admin Command Prompt. TrustedInstaller Command Prompt is required.
Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T09:39:56.2266667+00:00

Standard Disclaimer: There is a link to a non-Microsoft website. The page appears to provide accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as PUPs (Potentially Unwanted Products).
Daniel 15 Reputation points

2026-02-14T09:57:20.6166667+00:00

I was able to do this.

The first two gave back errors, but the last two worked.

The errors stated "The module "XXXX" was loaded but the entry-point dllUnregisteredServer was not found. Make sure that XXXX is a valid DLL or OCX file and then try again.
Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T10:01:46.3833333+00:00

Can you please confirm you ran them from TrustedInstaller Command Prompt instead of the admin Command Prompt?
Daniel 15 Reputation points

2026-02-14T10:05:40.9533333+00:00

Yes, I ran them from a Command Prompt opened under AdvancedRun with the settings of TrustedInstaller
Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T10:06:50.33+00:00
I hope you ran the following command as well. If not, please run it from TrustedInstaller Command Prompt.

"C:\Windows\System32\SecurityHealth\SecurityHealthSetup.exe" "C:\WINDOWS\system32\SecurityHealth\10.0.29510.1001-0"

Restart Windows.
Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T10:07:38.32+00:00

That has to be run from TrustedInstaller Command Prompt.
Daniel 15 Reputation points

2026-02-14T10:22:31.4933333+00:00

I did miss that one somehow, apologies.
I have done it now, but I do not get any output from running that line of code, and receive the same errors for the 2 following lines.

I went ahead and extracted the two dll files from the earlier exe, and replaced them in my folders, in case they were also corrupted. (using the method you showed me earlier). I tried rerunning some of the items you suggested since them, but no changes to results.
Khalil 40 Reputation points

2026-02-14T10:25:23.9966667+00:00

Could this be a system bug?
Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T10:27:38.57+00:00
Ok. Those two errors are normal. I just tested them on my systems here.

Let's manually install the update.

Download SecHealthFix_Windows11.zip

Unzip the archive to a folder. Move the REG file to the C drive's root directory.

Using AdvancedRun, start Regedit.exe as TrustedInstaller. (see screenshot)

From the File menu in Regedit, choose Import..

Dismiss the "Location is not available" error message by clicking OK:

Browse C:\ and import the REG file (SecHealthFix_Windows11.reg).

Restart Windows.

Standard Disclaimer: There is a link to a non-Microsoft website. The page appears to provide accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as PUPs (Potentially Unwanted Products).
Daniel 15 Reputation points

2026-02-14T10:32:44.8033333+00:00

IT IS WORKING!!! (without doing your last post)

PS C:\Users\odhan> Start-Service -Name windefend, securityhealthservice, wscsvc -Verbose

VERBOSE: Performing the operation "Start-Service" on target "Windows Security Service (securityhealthservice)".

VERBOSE: Performing the operation "Start-Service" on target "Microsoft Defender Antivirus Service (windefend)".

VERBOSE: Performing the operation "Start-Service" on target "Security Center (wscsvc)".

PS C:\Users\odhan> gsv windefend, securityhealthservice, wscsvc | select Name, StartType, Status | ft -auto

Name StartType Status

securityhealthservice Manual Running

windefend Automatic Running

wscsvc Automatic Running
Khalil 40 Reputation points

2026-02-14T10:34:06.39+00:00

I don't know why I can't open your screenshot... I've also encountered this problem and posted a related question. Could you help me?
Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T10:39:44.2433333+00:00

@Khalil:

Please check this link for the screenshot.

However, I suggest starting a new thread for your issue because there are many involved in this error. The REG file may not necessarily apply to your PC.

Standard Disclaimer: There is a link to a non-Microsoft website. The page appears to provide accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as PUPs (Potentially Unwanted Products).
Khalil 40 Reputation points

2026-02-14T10:43:24.5433333+00:00

My post is here: https://learn.microsoft.com/zh-cn/answers/questions/5775515/securityhealth10-0-29510-1001-0securityhealthsso-d Could you please take a look and help me as well? Thank you very much.
Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T10:48:34.6366667+00:00

Done, @Khalil.
Josh 0 Reputation points

2026-03-01T13:14:04.0933333+00:00
Hi, Ramesh. When I try to run this in TrustedInstaller Command Prompt, this is what the first thing it will say: "The filename, directory name, or volume label syntax is incorrect."

"C:\Windows\System32\SecurityHealth\SecurityHealthSetup.exe" "C:\WINDOWS\system32\SecurityHealth\10.0.29510.1001-0"

Answer 3

Ramesh Srinivasan 81,185 Independent Advisor

Hi Daniel,

Please open securityhealthsetup_b0f4702a05e43a3f7389ee3ff73a37084bd8267c.exe using 7-Zip, and explore the .rsrc\RCDATA\ folder in the archive.

Copy SecurityHealthSSO.dll to the desktop.

Open Command Prompt admin and run these commands:

cd /d C:\Windows\System32\SecurityHealth\10.0.29510.1001-0

takeown /f SecurityHealthSSO.dll /a

icacls SecurityHealthSSO.dll /grant *S-1-5-32-544:(F)

Now, copy SecurityHealthSSO.dll from your desktop to the following C:\Windows\System32\SecurityHealth\10.0.29510.1001-0 folder. Overwrite target file when prompted.

Daniel 15 Reputation points

2026-02-14T08:37:29.17+00:00

How do I copy the file from desktop to the folder - with administrator privileges?

I had to open cmd as administrator to get your code to work, but then I am being denied from copying and pasting the file - as we have allowed admin to have access but not normal me...
Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T08:41:06.79+00:00

Can you post the output of those commands?
Daniel 15 Reputation points

2026-02-14T08:47:23.69+00:00

Ok, I was able to alter the permissions on the file while in explorer.exe opened in cmd under administrator.

I could then replace the file with the one you helped me get.

I then reverted the permissions back to how they were before, for security...

and am about to restart my computer! Will report back!
Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T08:49:24.1+00:00

I had to open cmd as administrator to get your code to work

Yes, that why I mentioned Command Prompt admin.
Daniel 15 Reputation points

2026-02-14T08:54:54.96+00:00

Ok, so the error message is no longer appearing. However I tried to open Windows Security, and it still does not open.

Is there any way to force a full replacement of Windows Security?
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Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T08:57:46.49+00:00
Unfortunately, there is no option to fully remove and reinstall the Windows Security Platform.

Please share your Farbar scan logs for analysis.

Download Farbar Recovery Scan Tool 64-bit FRST64.exe

If the OS language is not English, rename FRST64.exe to FRST64English.exe.

Run the program. Don't check or uncheck any options. Click "Scan".

Add the two logs, FRST.txt and Addition.txt, to a zip archive.

Share the zip file on OneDrive or GoFile.io, and post the link here.

Note: If Microsoft Edge or Chrome mislabels the Farbar Scanner executable as PUA/malware, choose to keep it by tapping … in the bottom bar, choosing Keep, and then choosing Keep anyway in the dialog that appears. See this screenshot. It's a safe tool used in most antimalware forums.

Standard Disclaimer: There is a link to a non-Microsoft website. The page appears to provide accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as PUPs (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Daniel 15 Reputation points

2026-02-14T09:19:09.0533333+00:00

first time using that and sharing links online from my onedrive. Let me know when you have it so I can disable.
Ramesh Srinivasan 81,185 Reputation points Independent Advisor

2026-02-14T09:20:41.61+00:00

Got it. The files can now be unshared.
Shade 20 Reputation points

2026-04-13T18:12:26.25+00:00

Hello i have the same problem and im trying to follow the solution but im using winrar and i cant seem to find the file ur talking about the one i need to copy.

Answer 4

Ramesh Srinivasan 81,185 Independent Advisor

Hi, This is Ramesh.

Please download the Windows Security Platform update installer from the Microsoft link below:

https://catalog.s.download.windowsupdate.com/d/msdownload/update/software/defu/2026/01/securityhealthsetup_b0f4702a05e43a3f7389ee3ff73a37084bd8267c.exe

Save it to the desktop.

Right-click on the file and choose Run as administrator.

Restart Windows.

Let me know if that solves the issue. If it doesn't, we need to manually extract the DLL.

Daniel 15 Reputation points

2026-02-14T06:47:15.54+00:00

Thank you, but that did not work. When I ran it as administrator on the desktop, it asked for permission to run, and I gave it, but then nothing seemed to happen. I gave it some time and restarted the computer and the error reappeared.

I also did a reinstallation of Windows 11 while keeping my files/programs, but that failed to fix the issue.

I have also done repair and reset of Windows security in the system menu (start/system/system components/Windows Security), to no avail.

When I try to run Windows Security from the app list, the window opens and stalls out with the blue shield visible.
Pa Pi 0 Reputation points

2026-02-18T17:33:56.2333333+00:00

hallo habe genau das gleiche Problem wie sie. Also es scheint, als ob einige damit Probleme haben. Habe auch alles was hier als Lösung angeboten wurde ausprobiert aber alles ohne Erfolg.
Pa Pi 0 Reputation points

2026-02-18T17:42:15.1633333+00:00

Hi Ramesh,

I extracted the DLL manually. Unfortunately, I can't overwrite the file. Access is denied.
Ramesh 176.2K Reputation points Volunteer Moderator

2026-02-18T17:44:04.5633333+00:00

Hi Pa Pi,

Please boot into Safe mode and replace the file. In earlier versions of the Windows Security platform, you could replace the file in normal mode. But things seem to have changed in the latest platform version.

Answer 5

To fix the error related to securityhealthsso.dll, you can follow these steps:

Run System File Checker (SFC): This tool can help repair missing or corrupted system files. Open an elevated Command Prompt and run the following command:
```
   sfc /scannow
```
This will scan your system for issues and attempt to repair them.
Use DISM Tool: If SFC does not resolve the issue, you can use the Deployment Imaging Service and Management Tool (DISM) to repair the Windows image. Run the following commands in an elevated Command Prompt:
```
   dism /online /cleanup-image /restorehealth
   sfc /scannow
```
This will check for any issues with the Windows image and repair them.
Check for Windows Updates: Ensure your system is fully updated, as updates can fix bugs and security issues. Go to Settings > Update & Security > Windows Update and check for updates.
Reinstall Windows Security: If the problem persists, you may need to reinstall the Windows Security app. You can do this through the Settings > Apps > Apps & features section.
Replace the DLL File: If you still need a copy of the securityhealthsso.dll file, you can try to find it from another working Windows installation with the same version. Copy the file to the same location on your system. Make sure to back up the existing file before replacing it.
Contact Microsoft Support: If none of the above steps work, consider reaching out to Microsoft Support for further assistance.

Warning: Avoid downloading DLL files from untrusted sources, as they may contain malware or cause further issues.

References:

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How to fix securityhealth\10.0.29510.1001-0\securityhealthsso.dll error

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