This tutorial contains instructions to fix the error 0x800106ba in Microsoft Security Essentials or in Defender Antivirus: “The service couldn’t be started. The program’s service has stopped.”
The Defender Antivirus & Security Essentials error 0x800106ba “Service Couldn’t be Started”, usually occurs when a third-party antivirus program is installed or because a malware program has disabled antivirus protection on your computer. To fix the error 0x800106ba follow the step below.
Attention:
If you receive the Security Essentials error 0x800106ba, after installing a third party antivirus, this is normal. At this case, you have to uninstall the third-party antivirus to fix the problem.
Method 1. Turn on the Real Time Protection Manually.
In some cases the error 0x800106ba in Security Essentials & Defender Antivirus can be easily resolved by activating the real-time protection. So, click the
Turn on
button and wait to see if the problem is resolved. If after 1-2 minutes, the problem remains, to the next method.
Method 2. Scan your computer for Malware & Viruses.
The next method to fix the error “The service couldn’t be started” in Defender Antivirus (or in Security Essentials AV), is to scan and clean your system from viruses and malware. For that task follow the instructions in this guide:
How To Scan Your Computer for Viruses and other Malicious Programs.
Method 3. Enable the Windows Defender Service in Registry.
1. Open the Registry Editor. To do that:
1. Press Windows
+
R
keys to open the run command box.2. Type
regedit
and press
Enter
.
3. In Windows registry editor locate the following key:
- HKEY_LOCAL_MACHINESYSTEMCurrentControlSetservicesWinDefend
4. At the right pane, double click at the Start value and set the value data from 4 to
2
.
5. When done, click
OK
.
6. Close the registry editor and
restart
your PC.
7. If after restart the problem persists continue to next method.
Method 4. Turn On the Real Time Protection from Registry.
1. Open the
Registry Editor.
2. Navigate to the following key at the left pane:
- HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows Defender
3. Right click at the
Windows Defender
key and click
Permissions.
4. Click
Advanced
and then click
Change
owner.
5. At “Enter the name to select” box, type
Administrators
and click
OK
.
6. Click
Replace owner on subcontainers and objects
and click
Apply.
7. Double click at
Administrators
entry.
8. Check the
Full Control
check box and then click
OK
three (3) times to close permission properties.
9.
Close
Registry Editor.
10. Re-
open
Registry Editor and navigate to the same registry location:
- HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows Defender
11. At the right pane, double click to open the
DisableAntiSpyware
REG_DWORD value and change the value data to
0
12. Then open the
DisableAntiVirus
REG_DWORD value and change the value data to
0
. *
* Note:
If you own Windows 7 OS, skip this and the next step, close the registry editor and restart your PC.
13. Finally, navigate to this key:
- HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesSecurityHealthService
14. At the right pane double click at
Start
REG_DWORD value and change the value data to
3
.
15.
Close
Registry Editor and
restart
your computer.
That’s all folks! Did it work for you?
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