How to manually install Windows Defender?

I

infinity

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    MSI B450 Tomahawk Max
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Bree

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infinity said:
I just realised it's not available. How do I manually install it?
Click to expand...
Defender should be installed already, it's part of Windows. One reason it could be missing is if you have installed a 3rd-party AV. Doing so will disable Defender. You can't run two AVs at the same time.
 

My Computers

System One System Two

  • OS
    Windows 11 Home
    Computer type
    Laptop
    Manufacturer/Model
    Acer Aspire 3 A315-23
    CPU
    AMD Athlon Silver 3050U
    Memory
    8GB
    Graphics Card(s)
    Radeon Graphics
    Monitor(s) Displays
    laptop screen
    Screen Resolution
    1366x768 native resolution, up to 2560x1440 with Radeon Virtual Super Resolution
    Hard Drives
    1TB HDD
    Browser
    Edge, Firefox
    Antivirus
    Defender
    Other Info
    fully 'Windows 11 ready' laptop. Windows 10 C: partition migrated from my old unsupported 'main machine' then upgraded to 11. A test migration ran Insider builds for 2 months. When 11 was released on 5th October it was re-imaged back to 10 and was offered the upgrade in Windows Update on 20th October.


    My SYSTEM THREE is a Dell Latitude 5410, i7-10610U, 32GB RAM, 512GB ssd, Windows 11 Pro.
  • Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Dell Lattitude E4310
    CPU
    i5 M 520
    Motherboard
    0T6M8G
    Memory
    4GB
    Screen Resolution
    1366x768
    Hard Drives
    500GB HDD
    Browser
    Firefox, Edge
    Antivirus
    Defender
    Other Info
    unsupported machine: Legacy bios, MBR, TPM 1.2, upgraded from W10 to W11 using W10/W11 hybrid install media workaround.


    My SYSTEM THREE is a Dell Latitude 5410, i7-10610U, 32GB RAM, 512GB ssd, Windows 11 Pro.
I

infinity

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hmm I have not installed a new AV yet though.
 

My Computer

System One

  • OS
    Win 11
    Computer type
    PC/Desktop
    CPU
    Ryzen 3600
    Motherboard
    MSI B450 Tomahawk Max
    Memory
    GSkill RipJawz 16Gbx2
    Graphics Card(s)
    GTX960
    Screen Resolution
    2560x1440
    Hard Drives
    WD750 SSD 1TB
    PSU
    650w FSP
Fabler2

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Do you have Windows Security showing in the all apps list?
 

My Computers

System One System Two

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    Win 10 Home
    Computer type
    Laptop
    Manufacturer/Model
    ASUS VivoBook
    CPU
    AMD Ryzen 7 3700U with Radeon Vega Mobile Gfx
    Motherboard
    ASUSTeK COMPUTER INC. X509DA (FP5)
    Memory
    12GB
    Graphics Card(s)
    RX Vega 10 Graphics
    Monitor(s) Displays
    Generic PnP Monitor (1920x1080@60Hz)
    Screen Resolution
    1920x1080@60Hz
    Hard Drives
    INTEL SSD 660p 512GB NVMe
    Internet Speed
    25 Mbps
    Browser
    Edge
    Antivirus
    Defender
  • Operating System
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    ACER
    CPU
    AMD Ryzen 7 5800H / 3.2 GHz
    Motherboard
    CZ Scala_CAS (FP6)
    Memory
    16 GB (2 x 8 GB) DDR4 SDRAM 3200 MHz
    Graphics card(s)
    NVIDIA GeForce RTX 3060 6 GB GDDR6 SDRAM
    Sound Card
    Realtek Audio. NVIDIA High Definition Audio
    Monitor(s) Displays
    15.6" LED backlight 1920 x 1080 (Full HD) 144 Hz
    Screen Resolution
    1920 x 1080 (Full HD)
    Hard Drives
    1.024 TB SSD M.2 2280 - Samsung
    PSU
    180 Watt, 19.5 V
    Mouse
    Logitech
    Internet Speed
    25 Mbps
    Browser
    Edge
    Antivirus
    Defender
I

infinity

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no there isn't.
 

My Computer

System One

  • OS
    Win 11
    Computer type
    PC/Desktop
    CPU
    Ryzen 3600
    Motherboard
    MSI B450 Tomahawk Max
    Memory
    GSkill RipJawz 16Gbx2
    Graphics Card(s)
    GTX960
    Screen Resolution
    2560x1440
    Hard Drives
    WD750 SSD 1TB
    PSU
    650w FSP
cereberus

cereberus

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Unless you have some modified version of Windows, or been using some dodgy scripts to remoove/disable it it is virtually impossible not to have Defender as it is a core application.

Reinstalling Windows from scratch is your only realistic solution.
 

My Computer

System One

  • OS
    Windows 10 Pro + others in VHDs
    Computer type
    Laptop
    Manufacturer/Model
    ASUS Vivobook 14
    CPU
    I7
    Motherboard
    Yep, Laptop has one.
    Memory
    16 GB
    Graphics Card(s)
    Integrated Intel Iris XE
    Sound Card
    Realtek built in
    Monitor(s) Displays
    N/A
    Screen Resolution
    1920x1080
    Hard Drives
    1 TB Optane NVME SSD, 1 TB NVME SSD
    PSU
    Yep, got one
    Case
    Yep, got one
    Cooling
    Stella Artois
    Keyboard
    Built in
    Mouse
    Bluetooth , wired
    Internet Speed
    72 Mb/s :-(
    Browser
    Edge mostly
    Antivirus
    Defender
    Other Info
    TPM 2.0
I

infinity

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I see. in that case I'll just go with a 3ʳᵈ party AV. Is Avast the absolute best compared to all others in detection rate?
 

My Computer

System One

  • OS
    Win 11
    Computer type
    PC/Desktop
    CPU
    Ryzen 3600
    Motherboard
    MSI B450 Tomahawk Max
    Memory
    GSkill RipJawz 16Gbx2
    Graphics Card(s)
    GTX960
    Screen Resolution
    2560x1440
    Hard Drives
    WD750 SSD 1TB
    PSU
    650w FSP
Bree

Bree

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infinity said:
Is Avast the absolute best compared to all others in detection rate?
Click to expand...
No, there is no single clear ''best'. Almost all, including Defender, get ranked equally with a top score of straight 6's here:
www.av-test.org

Test antivirus software for Windows 10 - October 2021

The current tests of antivirus software for Windows 10 from October 2021 of AV-TEST, the leading international and independent service provider for antivirus software and malware.
www.av-test.org www.av-test.org
 

My Computers

System One System Two

  • OS
    Windows 11 Home
    Computer type
    Laptop
    Manufacturer/Model
    Acer Aspire 3 A315-23
    CPU
    AMD Athlon Silver 3050U
    Memory
    8GB
    Graphics Card(s)
    Radeon Graphics
    Monitor(s) Displays
    laptop screen
    Screen Resolution
    1366x768 native resolution, up to 2560x1440 with Radeon Virtual Super Resolution
    Hard Drives
    1TB HDD
    Browser
    Edge, Firefox
    Antivirus
    Defender
    Other Info
    fully 'Windows 11 ready' laptop. Windows 10 C: partition migrated from my old unsupported 'main machine' then upgraded to 11. A test migration ran Insider builds for 2 months. When 11 was released on 5th October it was re-imaged back to 10 and was offered the upgrade in Windows Update on 20th October.


    My SYSTEM THREE is a Dell Latitude 5410, i7-10610U, 32GB RAM, 512GB ssd, Windows 11 Pro.
  • Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Dell Lattitude E4310
    CPU
    i5 M 520
    Motherboard
    0T6M8G
    Memory
    4GB
    Screen Resolution
    1366x768
    Hard Drives
    500GB HDD
    Browser
    Firefox, Edge
    Antivirus
    Defender
    Other Info
    unsupported machine: Legacy bios, MBR, TPM 1.2, upgraded from W10 to W11 using W10/W11 hybrid install media workaround.


    My SYSTEM THREE is a Dell Latitude 5410, i7-10610U, 32GB RAM, 512GB ssd, Windows 11 Pro.
TairikuOkami

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infinity said:
Is Avast the absolute best compared to all others in detection rate?
Click to expand...
Avast, AVG, Kaspersky, Defender, are a few AVs that can detect fileless malware, some better than others.
 

My Computer

System One

  • OS
    Windows 11 Home
    CPU
    AMD Ryzen 5 3600 (07/19)
    Motherboard
    MSI B450 TOMAHAWK 7C02v1H6 (07/19)
    Memory
    4x 8GB ADATA XPG GAMMIX D10 DDR4 3200MHz CL16
    Graphics Card(s)
    MSI Radeon RX 580 ARMOR 8G OC (08/19)
    Sound Card
    Creative Sound Blaster Z (11/16)
    Monitor(s) Displays
    24" AOC G2460VQ6 (01/19)
    Screen Resolution
    1920×1080@75Hz + FreeSync (DisplayPort)
    Hard Drives
    ADATA XPG GAMMIX S11 Pro SSD 512GB (07/19)
    PSU
    Seasonic M12II-520 80 Plus Bronze (11/16)
    Case
    Lian Li PC-7NB + 3x Noctua NF-S12A FLX@700rpm (11/16)
    Cooling
    CPU Cooler Noctua NH-U12S@700rpm
    Keyboard
    HP Pavilion Wireless Keyboard 600 (05/21)
    Mouse
    HP Wireless Silent 280M Mouse (05/21)
    Internet Speed
    300/30 Mbps via RouterOS (05/21) + TCP Optimizer
    Browser
    Microsoft Edge
    Antivirus
    None
    Other Info
    Headphones: Sennheiser RS170 (09/10) + Software: https://tinyurl.com/7hkjyhsj
cereberus

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I would be more concerned why PC does not have Defender. Who knows what type of malware e.g. keyloggers have been installed already. Personally, I would not take the risk and teinstall from scratch and then change all online pssswords e.g. to bank, ebay etc.

Paranoia ? Maybe but can you afford to take the risk?
 

My Computer

System One

  • OS
    Windows 10 Pro + others in VHDs
    Computer type
    Laptop
    Manufacturer/Model
    ASUS Vivobook 14
    CPU
    I7
    Motherboard
    Yep, Laptop has one.
    Memory
    16 GB
    Graphics Card(s)
    Integrated Intel Iris XE
    Sound Card
    Realtek built in
    Monitor(s) Displays
    N/A
    Screen Resolution
    1920x1080
    Hard Drives
    1 TB Optane NVME SSD, 1 TB NVME SSD
    PSU
    Yep, got one
    Case
    Yep, got one
    Cooling
    Stella Artois
    Keyboard
    Built in
    Mouse
    Bluetooth , wired
    Internet Speed
    72 Mb/s :-(
    Browser
    Edge mostly
    Antivirus
    Defender
    Other Info
    TPM 2.0
WXC

WXC

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Windows 10 Pro 64-bit 21H2 19044.1466
cereberus said:
I would be more concerned why PC does not have Defender. Who knows what type of malware e.g. keyloggers have been installed already. Personally, I would not take the risk and teinstall from scratch and then change all online pssswords e.g. to bank, ebay etc.

Paranoia ? Maybe but can you afford to take the risk?
Click to expand...

Worth repeating. I agree. (y)


@infinity
 

My Computer

System One

  • OS
    Windows 10 Pro 64-bit 21H2 19044.1466
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell/Vostro 470 (Year 2012)
    CPU
    Intel i7-3770 @ 3.40GHz
    Memory
    8 GB
    Graphics Card(s)
    AMD 7500 Radeon HD Series
    Sound Card
    Realtek Hi-Def Audio
    Monitor(s) Displays
    Dell U2412M
    Hard Drives
    1TBHDD
    Keyboard
    Dell/USB
    Mouse
    Dell/USB
    Internet Speed
    100/10
    Browser
    Edge
    Antivirus
    Windows Security/MalwareBytes Premium
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