'Windows Defender Error Code 0x800106ba

Question

I have updated to Windows 10. Since I updated I have had trouble with Defender not being able to scan my computer. it seems to get 80% through the scan and then stops and says it cannot scan and gives me the error code  0x800106. I have tried many of the supposed fixes and have had no success. 

<Original Title:  Windows error code 0x800106>

<Moved from Windows>

Answer 1

Windows Defender has not been able to complete a scan since 11/25/2015.  It get part of the way through the scan and then stops. It gives the above error 0x800106ba in the support section. It says that it has stopped and to Restart the computer or manually start Defender. Neither resolves the problem. I have had to use Malwarebytes.org to scan for viruses and malwar since November.

Also several of my apps will not open. They too seem to start but fail on the start and disappear. I am not sure if they are related.  [SOURCE]

Assuming Windows 10 64-bit...

Please answer each of the following [admittedly tedious] diagnostic questions in a correspondingly-numbered list in your very next reply, preferably without quoting this post:

1a. When (approx. date) did you purchase the computer?

1b. When (exact date, preferably) did you upgrade to Win10?

2. Did you upgrade a Win7 SP1 computer to Win10 or a Win8.1 computer? [PICK ONE]
3. Was the upgrade offered & installed via Windows Update or did you use the Media Creation Tool & ISO download?
4. When (exact date) was MalwareBytes' Anti-Malware (MBAM) installed? Is it MBAM Premium or MBAM Free? Has MBAM ever detected & quarantined anything since it's been installed?
5. What other third-party anti-malware applications (i.e., not Windows Defender!) are installed, if any?  What third-party firewall, if any?
6. Has a Norton application or a McAfee application EVER been installed on the computer since you bought it?
7. Did a Norton free-trial or a McAfee free-trial [pick one] come preinstalled on the computer when you bought it? (Doesn't matter if you never used or Activated it.)

8. Is KB3124200 or KB3124260 [<=PICK ONE] listed in Installed Updates (not Update History)? [1]

9. Is Adobe Flash Player v20.0.0.272 installed? TEST HERE USING INTERNET EXPLORER OR EDGE ONLY => http://www.adobe.com/software/flash/about/ 

Example of the Version Info box on that page

(ignore the table below it)

10. Is Google Chrome, Firefox, or any other alternate browser installed?

11. Are you in the habit of using "registry cleaners" (e.g., CCleaner's Registry Cleaner component; Comodo System Cleaner; Advanced SystemCare; Advanced System Optimizer; Glary Utilities; McAfee QuickClean; AVG PC TuneUp; Norton Registry Cleaner; Norton PC Tuneup; PCTools Optimiser; PC Doctor; Registry Mechanic; RegCure; RegClean Pro;  Registry Booster; SpeedUpMyPC; System Mechanic; TuneUp Utilities; WinMaximizer; WinSweeper; Wise Care 365; Wise Cleaner)?

==============================================

[1] Control Panel | Programs and Features | View installed updates (in left-hand menu)

Answer 2

Windows Defender has not been able to complete a scan since 11/25/2015.  It get part of the way through the scan and then stops. It gives the above error 0x800106ba in the support section. It says that it has stopped and to Restart the computer or manually start Defender. Neither resolves the problem. I have had to use Malwarebytes.org to scan for viruses and malwar since November.

Also several of my apps will not open. They too seem to start but fail on the start and disappear. I am not sure if they are related.

Becoming frustrated with Windows 10.

Answer 3

Hi Howard,

Thank you for posting your query on Microsoft Community. Let me assist you.

Provide us with the below details for better clarity on the issue.

1. Are you facing the issue on a local or the Microsoft user account?

2. What are the troubleshooting steps which you have already tried?

3. Are you running any other security scan along with defender?

I suggest you to sign out from the current user account, restart the system and login to the Microsoft user account and check the status of the issue. Further you may try setting the Windows Defender service as Automatic and check if it helps. You can also try reinstalling the application to check if it helps. Please refer the steps provided in the below article to troubleshoot the issue.

https://support.microsoft.com/en-us/kb/931849

Also try the below steps to check if it helps.

Open administrative Command Prompt, type following commands one by one followed by Enter key:

regsvr32  atl.dll

regsvr32  wuapi.dll

regsvr32  softpub.dll

regsvr32  mssip32.dll

Now close the Command Prompt, reboot the system and perform the scan to check if that helps.

Hope this information is helpful. Please do let us know if you need further assistance, we’ll be glad to assist you.