Windows Defender was turned off somehow, and was reported to me from Microsoft that was off and needed to be turned on, which I have unsuccessfully attempted, manually, restarting PC, restore points,

Hi, I Suggest not do delete Windows Defender and its now default antivirus/firewall provided by Microsoft. If you still want to delete it please do follow the below process to un-install manually.

1. Open a command Prompt and type the following to stop and then delete the Defender service:

• type in : sc stop windefend and press enter
• type in : sc delete windefend

2. Next you need to grant full permissions to and delete the following registry key so the Defender Control Panel entry can be deleted: open RUN command and type in regedit

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ControlPanel\NameSpace\{D8559EB9-20C0-410E-BEDA-7ED416AECC2A}

3. Also grant full permission and delete the Defender program registry key:

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender

4. Now take ownership of and delete the following folders:

• C:\Program Files\Windows Defender
• C:\ProgramData\Microsoft\Windows Defender
• C:\Program Files (x86)\Windows Defender (for 64-bit users only) and reboot the computer.

Hi Anon,
The 0x800106ba error may occur after Windows Defender is updated due to the computer's inability to update the Windows Defender firewall. It may not have applicable permissions needed for the update, or it may not have the files necessary for updating itself.

The Fix

Set Windows Defender to Automatic - You can set the Windows Defender service to Automatic, Disabled or Manual. Setting it to automatic might solve the problem. Follow these steps:

1. Click Start > type services in the Search box > click Services in the Programs list.
2. If you are asked for a Password before you continue, then enter the password > click Continue.
3. Double-click Windows Defender, and click Automatic in the start-up box > click OK.

Uninstall and reinstall Windows Defender - If the first procedure did not help resolve the problem, try un-installing and then reinstalling Windows Defender. Due to the fact that Windows Defender is a Windows component, we will use AppWiz to un-install it from the computer. Follow these steps:

1. Press Windows Key + R > type appwiz.cpl > Press Enter
2. Click Windows Defender > click Remove
3. Follow the prompts to uninstall Windows Defender

Let me know how you go!

Windows 8 includes an automatically loaded updated version of Windows Defender
which is a full antivirus based on Microsoft Security Essentials.
(Windows Defender
for XP, Vista, and Windows 7 was only antispyware.)
So if you upgrade the protection
is automatic and is on by default at installation.

Windows Defender and Windows SmartScreen fight viruses and other malware
http://windows.microsoft.com/en-US/windows-8/windows-defender#1TC=t1

How to Create a "Windows Defender" Shortcut in Windows 8
http://www.eightforums.com/tutorials/6862-windows-defender-create-shortcut-windows-8-a.html

How to Add a "Windows Defender" Cascading Desktop Context Menu in Windows 8
http://www.eightforums.com/tutorials/8450-windows-defender-cascading-desktop-context-menu-create-windows-8-a.html

At the startup of Windows XP, you may see an error that says "Unable to Start Windows Defender service". This issue occurs, if some of the registry entries are corrupted. Restarting the service from the service console may also prompt the same error.

To resolve this issue, you may need to uninstall and reinstall the Windows Defender. Follow the below mentioned steps:

1. Click Start, Control Panel.
2. Click Add or Remove Programs.
3. Click Windows Defender, and click Remove.

This will uninstall Windows Defender. You can download and reinstall the updated version from the following link:

http://www.microsoft.com/athome/security/spyware/software






Hope this helps!!! Let me know if you need more help


-Nadeem

Was the DVD damaged in so way? Does it show in Computer? Does it need driver? Which Gateway do you have? Windows Defender can be downloaded or fixed online.Do you have a Anti Virus that has turned off Windows Defender? Try MS Fix It: http://support.microsoft.com/kb/931849 OR http://support.microsoft.com/kb/931099

hi..you can only choose one antivirus program..usually when MSE is activated you cannot turn on windows defender..in any case that you had your system 2 activated antivirus it will affect the performance..

You can no longer update Windows Defender. Windows Defender has been replaced by Microsoft to Microsoft Security Essentials.Type in your browser " Windows Security Essentials Wikipedia"where you will find all the information Re. Windows Defender/Microsoft Security Essentials.Hope this helps you.
Regards Bill

Uninstall the Windows defender and install am updated version. If it doesn't work, try this:
To resolve this problem, follow these steps:

1. Uninstall Windows Defender, and then reinstall Windows Defender. To do this, follow these steps:
1. Click Start, click Run, type appwiz.cpl, and then click OK.
2. Click Windows Defender, and then click Remove.
3. Follow the prompts to uninstall Windows Defender.
4. To reinstall Windows Defender, visit the following Microsoft Web site:
http://www.microsoft.com/athome/secu...yware/software (http://www.microsoft.com/athome/secu...yware/software)
2. If this issue is not resolved after you complete step 1, uninstall Windows Defender, use the Windows Installer CleanUp utility, and then reinstall Windows Defender. To do this, follow these steps:
1. Click Start, click Run, type appwiz.cpl, and then click OK.
2. Click Windows Defender, and then click Remove.
3. Follow the prompts to uninstall Windows Defender.
4. To use the Windows Installer CleanUp utility, click the following article number to view the article in the Microsoft Knowledge Base:
290301 (http://support.microsoft.com/kb/290301/ ) Description of the Windows Installer CleanUp utility
5. To reinstall Windows Defender, visit the following Microsoft Web site:
http://www.microsoft.com/athome/secu...yware/software (http://www.microsoft.com/athome/secu...yware/software)
3. If this issue is not resolved after you complete step 2, follow this step:
1. Click Start, click Run, type regsvr32 file name, and then click OK.

Note In this step, file name is a placeholder for the following files.

Repeat this procedure for the following files:
* wuapi.dll
* wuaueng.dll
* wucltui.dll
* wups.dll
* wuweb.dll
* atl.dll
* softpub.dll
* wintrust.dll
* initpki.dll
* mssip32.dll"

cheers ...