Windows 10: When I open Windows Security/Microsoft Defender, it refuses to open.

Windows security & Microsoft Defender not openning.avidefender.log

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Windows Defender Security Centre crashes on opening

Every time I try to open Windows Defender Security Centre, the window opens and closes immediately. There is no error logged in the event logs.

The old Windows Defender interface - MSASCui.exe opens just fine; the problem lies with MSASCuiL.exe which crashes instantly after opening.

I do not have any other antivirus software installed, nor have I ever. Scans with Microsoft Safety Scanner and MSASCui.exe do not find any malware.

Steps tried

1. All the steps listed here on the troubleshooting article.

2. sfc /scannow reveals no problems

3. dism /online /cleanup-image /restorehealth completes successfully but to no avail

4. Clean boot performed

5. In-place install performed

6. Attempted to open in safe mode

None of the steps above seem to work.

I am using a desktop I built myself, running windows 10 v1703 build 15063.632. The Defender Security Centre has worked in the past but for some strange reason has not for the past week, or so I noticed.

Please do assist - a clean fresh install is however not an acceptable solution as this is a critical work computer.

 

Windows Defender Security Centre will not open

Windows Defender Security Centre will not open.

In the Task Bar the little shield with a green tick is present. Double clicking does nothing. Right clicking brings up a menu but selecting an option does nothing.

Opening 'Windows Security' from the 'Settings' page opens up a window with:

• Open Windows Defender Security Centre - Clicking this does nothing
  
• Virus & threat protection - Clicking this does nothing
  
• Account protection - Clicking this does nothing
  
• Firewall & network protection - Clicking this does nothing
  
• App & browser control - Clicking this does nothing
  
• Device security - Clicking this does nothing
  
• Device performance & health - Clicking this does nothing
  
• Family options - Clicking this does nothing
  

Windows update is on and up to date. This is a valid/licensed and microsoft account linked version of win 10

 

Windows Defender Security Center Won't Stay Open

When I open Windows Defender Security Center, it opens and then closes itself.

I’m running Windows 10 Home, v1703, with the latest updates.

I run Norton Security as my primary AV & firewall with the latest updates.

I did a system reset in the last couple of months.

I have the latest Defender updates according to: https://www.microsoft.com/security/p...tions/adl.aspx

Defender seems to be functioning, but generating the following errors:

• Event ID 3: The Windows Security Center Service was unable to establish event queries with WMI to monitor third party AntiVirus, AntiSpyware and Firewall.
• Event ID 16: Error while updating Windows Defender status to SECURITY_PRODUCT_STATE_ON.
• Event ID 1000:

Faulting application name: SecHealthUI.exe, version: 10.0.15063.0, time stamp: 0x58ccbce5
Faulting module name: SecHealthUIDataModel.dll, version: 0.0.0.0, time stamp: 0x58ccbc8d
Exception code: 0xc0000005
Fault offset: 0x000000000015b847
Faulting process id: 0x27f0
Faulting application start time: 0x01d2f12745cc2b1f
Faulting application path: C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\SecHealthUI.exe
Faulting module path: C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\SecHealthUIDataModel.dll
Report Id: bcac3ab1-757d-47fb-8d4f-c089173b11e0
Faulting package full name: Microsoft.Windows.SecHealthUI_10.0.15063.0_neutral__cw5n1h2txyewy
Faulting package-relative application ID: SecHealthUI

I have tried options 3 and 5 in this tutorial: Turn On or Off Windows Defender Real-time Protection in Windows 10. Options 1 and 2 aren’t available to me since the settings window won’t stay open. Option 4 isn’t available for Windows Home.

As I said above, AFAICT, Defender seems to be working, but the Defender Security window won’t stay open and it’s generating a lot of errors.

Any suggestions for troubleshooting and/or fixing this issue?