Windows defender vanishes immediately after it starts

AritraDas

New Member
Messages
2
Location
Kolkata, West Bengal, India
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".
1.JPG
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 Computer

System One

  • OS
    Windows 8
    Computer type
    Laptop
    System Manufacturer/Model
    intel
    CPU
    Intel core i5-4200U CPU @1.60 GHz 2.30 GHz
    Motherboard
    intel core i5
    Memory
    8 GB
    Graphics Card(s)
    2 GB
    Mouse
    Logitech
    Antivirus
    None
Try to start windows defender in safe mode.
 

My Computer

System One

  • OS
    Windows 10 Pro
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Custom build
    CPU
    i5-6500 @3.20GHz
    Motherboard
    Gigabyte B150-HD3P-CF
    Memory
    16GB DDR4 2133 Crucial Ballistix Sport LT
    Graphics Card(s)
    MSI GeForce GTX 1060 GAMING X 6G
    Sound Card
    Built-in
    Monitor(s) Displays
    Liyama ProLite XB2483HSU-B2
    Screen Resolution
    1920 x 1080
    Hard Drives
    Crucial MX200 500GB & Toshiba DT01ACA300 3TB
    PSU
    Corsair RM550x
    Case
    Fractal Design Define S
    Cooling
    Cooler Master TX3 i
    Keyboard
    Func KB-460 (MX Red)
    Mouse
    Corsair Gaming M65 RGB
    Browser
    Google Chrome
    Antivirus
    Bitdefender Total Security 2017 + MBAM Pro + MBAE Pro
    Other Info
    Creative Sound Blaster Tactic3D Rage V2 headset
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 Computer

System One

  • OS
    Windows 8
    Computer type
    Laptop
    System Manufacturer/Model
    intel
    CPU
    Intel core i5-4200U CPU @1.60 GHz 2.30 GHz
    Motherboard
    intel core i5
    Memory
    8 GB
    Graphics Card(s)
    2 GB
    Mouse
    Logitech
    Antivirus
    None
Try sfc/scannow a couple of times in safe mode and reboot after each sfc/scannow in order to repair corrupt files.
 

My Computer

System One

  • OS
    Windows 10 Pro
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Custom build
    CPU
    i5-6500 @3.20GHz
    Motherboard
    Gigabyte B150-HD3P-CF
    Memory
    16GB DDR4 2133 Crucial Ballistix Sport LT
    Graphics Card(s)
    MSI GeForce GTX 1060 GAMING X 6G
    Sound Card
    Built-in
    Monitor(s) Displays
    Liyama ProLite XB2483HSU-B2
    Screen Resolution
    1920 x 1080
    Hard Drives
    Crucial MX200 500GB & Toshiba DT01ACA300 3TB
    PSU
    Corsair RM550x
    Case
    Fractal Design Define S
    Cooling
    Cooler Master TX3 i
    Keyboard
    Func KB-460 (MX Red)
    Mouse
    Corsair Gaming M65 RGB
    Browser
    Google Chrome
    Antivirus
    Bitdefender Total Security 2017 + MBAM Pro + MBAE Pro
    Other Info
    Creative Sound Blaster Tactic3D Rage V2 headset

My Computer

System One

  • OS
    Win 8.1 64bit
    Computer type
    Laptop
    System Manufacturer/Model
    Toshiba
    CPU
    Intel i3, 2348
    Memory
    4GB
    Graphics Card(s)
    Intel HD3000
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