KB890830 Windows Malicious Software Removal Tool 5.123 - April 9

Microsoft Support

Windows Malicious Software Removal Tool (MSRT) 5.123 helps remove malicious software from computers running Windows11, Windows 10, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, or Windows Server 2008.

Microsoft generally releases MSRT monthly as part of Windows Update or as the standalone tool. Use this tool to find and remove specific prevalent threats and reverse the changes they have made (see covered threats). For comprehensive malware detection and removal, consider using Microsoft Safety Scanner.

This article contains information about how the tool differs from an antivirus or antimalware product, how you can download and run the tool, what happens when the tool finds malware, and tool release information. It also includes information for the administrators and advanced users, including information about supported command-line switches.

Note In compliance with the Microsoft Support Lifecycle policy, MSRT is no longer supported on Windows Vista and older platforms. For more information, go to Microsoft Support Lifecycle.

Remove specific prevalent malware with Windows Malicious Software Removal Tool (KB890830)

Manual download:

How to Use Malicious Software Removal Tool in Windows

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JGToy

Too young to know

Power User

VIP

Apr 9, 2024

Downloading...

My Computer

System One

OS

Windows 11

Computer type

PC/Desktop

Manufacturer/Model

Asus/Custom Build

CPU

Intel® Xeon® X5690 3.47GHz Six-Core

Motherboard

Asus P6T Deluxe v2

Memory

G.Skill PC3-12800 1600MHz 24GB

Graphics Card(s)

NVIDIA GeForce GTX 1050

Sound Card

SoundMAX ADI AD2000B HD Audio

Monitor(s) Displays

Acer T232HL Touch Screen

Screen Resolution

1920 x 1080 @ 60Hz

Hard Drives

6 Crucial MX500 SSD 1TB each.

PSU

Thermaltake Toughpower Gold 850W

Case

Thermaltake Armor VA8000SWA

Cooling

Thermaltake Air Cooling System

Keyboard

Illuminated Multimedia LED Keyboard

Mouse

M16 Dual Mode Illuminated Mouse - Bluetooth / 2.4 GHz Mode

Internet Speed

800 Mbps

Browser

Edge / Opera / Vivaldi / Chrome / Firefox / Brave

Antivirus

Windows Defender Security

JGToy

Too young to know

Power User

VIP

Apr 9, 2024

Completed!

My Computer

System One

OS

Windows 11

Computer type

PC/Desktop

Manufacturer/Model

Asus/Custom Build

CPU

Intel® Xeon® X5690 3.47GHz Six-Core

Motherboard

Asus P6T Deluxe v2

Memory

G.Skill PC3-12800 1600MHz 24GB

Graphics Card(s)

NVIDIA GeForce GTX 1050

Sound Card

SoundMAX ADI AD2000B HD Audio

Monitor(s) Displays

Acer T232HL Touch Screen

Screen Resolution

1920 x 1080 @ 60Hz

Hard Drives

6 Crucial MX500 SSD 1TB each.

PSU

Thermaltake Toughpower Gold 850W

Case

Thermaltake Armor VA8000SWA

Cooling

Thermaltake Air Cooling System

Keyboard

Illuminated Multimedia LED Keyboard

Mouse

M16 Dual Mode Illuminated Mouse - Bluetooth / 2.4 GHz Mode

Internet Speed

800 Mbps

Browser

Edge / Opera / Vivaldi / Chrome / Firefox / Brave

Antivirus

Windows Defender Security

Bree

Well-known member

Guru

VIP

Apr 9, 2024

Microsoft said:
MSRT is no longer supported on Windows Vista and older platforms.

MSRT, and the AV definitions, are still being delivered through Windows Update in Windows 7.

My Computers

System One System Two

OS

Windows 11 Home

Computer type

Laptop

Manufacturer/Model

Acer Aspire 3 A315-23-R9VY

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 Samsung EVO 870 SSD (from April 2026: 250GB EVO 850)

Internet Speed

150 Mbps

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 2021 it was re-imaged back to 10 and was offered the upgrade in Windows Update on 20th October. Windows Update offered the 22H2 Feature Update on 20th September 2022. It got the 23H2 Feature Update on 4th November 2023 through Windows Update, 24H2 on 3rd October 2024 through Windows Update by setting the Target Release Version for 24H2, and 25H2 on 30th September 2025 through Windows Update by setting the Target Release Version for 25H2.

UPDATE - 11 April 2026: due to mechanical deterioration this PC has been retired from active duty. The OS with all software and files has been migrated to my System Seven below to carry on as my general purpose 'main machine'.

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

My SYSTEM FOUR is a 2-in-1 convertible Lenovo Yoga 11e 20DA, Celeron N2930, 8GB RAM, 256GB ssd. Unsupported device: currently running Win10 Pro, plus Win11 Pro RTM and Insider Dev, Beta, and RP 24H2 as native boot vhdx.

My SYSTEM FIVE is a Dell Latitude 3190 2-in-1, Pentium Silver N5030, 8GB RAM, 1TB NVMe ssd, supported device running Windows 11 Pro, plus Insider Beta, Dev, and Canary builds (and a few others) as a native boot .vhdx.

My SYSTEM SIX is a Dell Latitude 5550, Core Ultra 7 165H, 64GB RAM, 1TB NVMe SSD, supported device, Windows 11 Pro 24H2, Hyper-V host machine. Updated to 25H2 on 30th September 2025.

My SYSTEM SEVEN is a Lenovo Thinkpad T580, Intel Core i7-8650U, 16GB RAM, 512GB NVMe SSD + 2nd 512GB NVMe SSD, a supported device for Windows 11. This is my current general purpose 'main machine'. The installed Windows 11 Home from my System One has been migrated to this machine.
Operating System

Windows 11 Pro

Computer type

Laptop

Manufacturer/Model

Dell Latitude E4310

CPU

Intel® Core™ i5-520M

Motherboard

0T6M8G

Memory

8GB

Graphics card(s)

(integrated graphics) Intel HD Graphics

Screen Resolution

1366x768

Hard Drives

500GB Crucial MX500 SSD

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. In-place upgrade to 22H2 using ISO and a workaround. Feature Update to 23H2 by manually installing the Enablement Package. In-place upgrade to 24H2 using hybrid 23H2/24H2 install media. Upgraded to 25H2 by Enablement Package. Also running Insider Dev, and Canary builds and Windows 10 as native boot .vhdx.

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

My SYSTEM FOUR is a 2-in-1 convertible Lenovo Yoga 11e 20DA, Celeron N2930, 8GB RAM, 256GB ssd. Unsupported device: currently running Win10 Pro, plus Win11 Pro RTM and Insider Dev, Beta, and RP 24H2 as native boot vhdx.

My SYSTEM FIVE is a Dell Latitude 3190 2-in-1, Pentium Silver N5030, 8GB RAM, 1TB NVMe ssd, supported device running Windows 11 Pro, plus Insider Beta, Dev, and Canary builds (and a few others) as a native boot .vhdx.

My SYSTEM SIX is a Dell Latitude 5550, Core Ultra 7 165H, 64GB RAM, 1TB NVMe SSD, supported device, Windows 11 Pro 24H2, Hyper-V host machine. Updated to 25H2 on 30th September 2025.

My SYSTEM SEVEN is a Lenovo Thinkpad T580, Intel Core i7-8650U, 16GB RAM, 512GB NVMe SSD + 2nd 512GB NVMe SSD, a supported device for Windows 11. This is my current general purpose 'main machine'. The installed Windows 11 Home from my System One has been migrated to this machine.