Windows 8 and 8.1 Forums

Windows defender vanishes immediately after it starts

  1. #1

    Windows defender vanishes immediately after it starts

    Hello Guys, I am using a windows 8 pre-loaded laptop. My McAfee one-year-subscription will end this week, so I decided to uninstall it altogether and turn on Windows Defender. I tried to startup Defender from search in the charms bar, but on clicking on Windows Defender in the results, nothing happened. Moreover I got a error message saying that the file was not found.

    So, I went to the official windows 8 page and checked out what they had to offer, and I did all of those.

    1. I restarted my PC several times.
    2. I downloaded the McAfee Product Removal Tool, and used it.
    3. I did a malware scan using Microsoft Safety Scanner, it ran for about an hour and then finishes successfully after uninstalling 2 more of my programs.
    4. I did a SFC scan. It ended saying "Windows Resource Protection found corrupt files but was unable to fix some of them. Details are included in the CBS.Log %WinDir%\Logs\CBS\CBS.log."
    5. I restarted Windows Security Center Service.
    Upto this point, there was no effect. Defender wouldn't even startup.
    6. I deleted "conflicting Registry Entries". Specifically, I deleted these keys: MSASCui.exe, MpCmdRun.exe or MsMpEng.exe under HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options.

    Now, when I start Defender, it starts up with the front screen showing "At risk".
    Click image for larger version
    As soon as I click "Start now" defender simply closes. And that's it. I did this many times but without any result, all it does is vanish as soon as I click "Start now".
    I'm in a real fix, because now my laptop has practically NO security or antivirus, please Help. Thanks.

      My System SpecsSystem Spec

  2. #2

    BSOD Kernel Dump Analyst
    Posts : 2,274
    Windows 10 Pro

    Try to start windows defender in safe mode.
      My System SpecsSystem Spec

  3. #3

    Okay, I tried to start it in Safe mode. This time, a different thing happened. As I clicked "Start now", the Defender actually started but only for 2 or 3 seconds, after which it automatically stopped. I retried but the same thing happenned. On starting it through Local Services, the same thing happenned. It started, but after a second or two, it stopped. What do I do now?
      My System SpecsSystem Spec

  4. #4

    BSOD Kernel Dump Analyst
    Posts : 2,274
    Windows 10 Pro

    Try sfc/scannow a couple of times in safe mode and reboot after each sfc/scannow in order to repair corrupt files.
      My System SpecsSystem Spec

  5. #5

    Posts : 375
    Win 8.1 64bit

    The first thing I would do is run Sfc /scannow at Cmd. Prompt with Adm. Privileges to check for file corruption.
    If any found run Dism /Online /Cleanup-Image /RestoreHealth same way then run Sfc /scannow again gator2013
    SFC /SCANNOW Command - Run in Windows 8

    Check the above tutorials.
      My System SpecsSystem Spec

  6. #6

    @AritraDas Dd you already solved your problem? Can you tell me how you solved it? I have also that problem. Thanks in advance.
      My System SpecsSystem Spec

Windows defender vanishes immediately after it starts
Related Threads
Hello, I am using Windows Defender in W8. I see that the Defender becomes only active after a few minutes. If the Defender is activated before than everthing is in red , and unable to start it. The fault code is than 0x80070426.
I click on the OneDrive icon on the Windows 8.1 Start screen and the app opens, then immediately closes. All other apps work OK. I have tried the troubleshooters, reset the Store cache and uninstalled and reinstalled Onedrive but the problem continues. Another issue that is probably related is,...
I can get it back to maximized but cannot get reduced image to show. It just vanished off to the left of my desktop. Anybody know how to get a reduced image back once it does this? Thanks in advanced. Spike PS, I've searched for an answer and while there may be one on this site, I was...
I m using the desktop with asus board p7h55 m le with navida quadro fx 3700 card...Windows 7 is working very fine on this system but now i change my windows to windows 8(full and activated version) i noticed that when i shut down my windows 8 and power off it also from the electricity then when...
Over the past few months I have been unable to us any programs that require fullscreen and it is very hard to surf the internet or type anything because my computer keeps deselecting and reselecting my active window. I have tried disabling the touch pad and unplugging my external mouse so that is...
Solved Windows 8 Freezes and Mouse Vanishes in BSOD Crashes and Debugging
I've recently installed Windows 8 Pro (32 bit) on an ASUS X5DIN laptop which was previously running Windows 7 Home Premium. At random (but frequent) intervals, the computer will freeze entirely, with the cursor disappearing and any audio getting stuck in a loop. The laptop doesn't respond to any...
When I launch the People app, the app opens for a brief moment and then immediately closes. If I search for a name that I know is in my People list, from the charms menu, then the People app will open with information about that person. But if I touch "Home", the app acts as before - briefly...
Eight Forums Android App Eight Forums IOS App Follow us on Facebook