[Software Update] Microsoft Security Essentials (MSE) 4.10.0209.0 Now Available for Download

UPDATED on Nov 29, 2016: Release of Microsoft Security Essentials 4.10.0209.0 version.

Microsoft has upgraded its free anti-malware utility "Microsoft Security Essentials" (MSE) to version 4.10.0209.0. Microsoft Security Essentials provides real-time protection for your PC that guards against viruses, spyware, and other malicious software.

MSE is simple to install, easy to use, and is automatically updated to protect your PC with the latest technology. It runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want without interruptions or long computer wait times.


Features List:

Comprehensive protection—Microsoft Security Essentials helps defend your computer against spyware, viruses, worms, Trojans, and other malicious software.

Easy to get, easy to use—Microsoft Security Essentials is available at no cost, there's no registration process that requires billing or personal information collection. It installs after a quick download and Genuine Windows validation and then stays automatically up-to-date with the latest protection technology and signature updates.

Quiet Protection—Microsoft Security Essentials doesn't get in your way. It runs quietly in the background and schedules a scan when your computer is most likely idle. You only see alerts when you need to take action.

MSE is absolutely free and can be used in Windows Vista and Windows 7. Both 32-bit and 64-bit versions are supported.

You should uninstall other antivirus software already running on your PC before installing Microsoft Security Essentials. Running more than one antivirus program at the same time can potentially cause conflicts that affect PC performance.

You can download it using following link:

Download Microsoft Security Essentials (MSE)

[Direct Download Links] Full Standalone Offline Installers

You must be using genuine Windows to install MSE.

Thanks to our reader "Vinay Godara" for the update...

NOTE: This article is updated whenever a new version of Microsoft Security Essentials is released. So keep checking this page regularly.

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  • Just an reiteration: MSE is absolutely free and can be used in Windows XP, Vista and Windows 7. Both 32-bit and 64-bit versions are supported. Therefore, Windows 8 and 8.1 are not supported(indeed, MSE is built into those OSes--albiet it is retro'd back to being called Windows Defender).

  • MSE 4.3 is better cause others slows down the system.

  • ^^ Even though it's light on resources it lacks powerful protection capability.Better to buy a AV itself.

  • I prefer BitDefender Internet Security 2014.

  • I'd hate it...I mean I'd REALLY hate to break it to you, but Microsoft is no longer recommending their Security Essentials programs anymore!! Just a quick bing/Google/Yahoo! will even tell you so.

    I think I'll stick with avast! if I get a new computer but for now on my main computer, I'll stay with AVG Internet Security on my slow, crappy Windows 7 Home Premium machine...I don't know why it's so slow...it never used to be like this until now and I reinstalled it August this year!!

    Specs: 2GB RAM, intel core 2 duo, Asus P5E motherboard, some kind of Asus video card which is really good, VMware Player 5.1.2 with a few virtual machines, VirtualBox 4.2.16 with a few virtual machines, Adobe photoshop Elements 11, Adobe Master Collection CS6, Avg internet security 2014, Microsoft Virtual PC for Windows XP Mode (I made one with home edition ^_^), Office Professional Plys/Visio Pro/Project pro 2013, ccleaner, recuva, speccy, the other one from piriform, and I'm sure there's more.

    AND does it make a differences that I run disk cleanup every month and that it's 32-bit?

  • VG

    ^^ Have you checked following?


  • Microsoft security essentials completely fail in AV-Test

  • @Kitten S. : Probably all those virtual machines with only 2GB RAM is the main reason. :)

  • VG, I actually found out that it was slow to load b/c I had a folder that was about 3GB in size on my desktop. I moved it to Documents.

    I shall explain:
    - Because I use resource hacker to make new programs out of old programs, I like to store the results in a folder called Folder on my desktop for easy access.
    - This folder will get cluttered up with other random stuff I make, and stuff I don't NeeD but want to keep for later.

    I advise that everyone doesn't store stuff other than program shortcuts and the Recycle Bin on the desktop.

  • MSE is great! it hassles me a lot less than any other AV:D I Recommend Microsoft Security Essentials. If your using XP, there's no more support for it after the 8th of April, that is, XP AND MSE on XP.

  • Changelog - added end of support notification for Windows XP

  • Got it via Windows Update. It's a good piece of software, my antimalware of choice.

  • AVOID downloading & installing Microsoft Security Essentials v4.5.216.0 if using Windows XP!
    That version will ALWAYS display a permanent yellow notification tray icon saying the XP system is "unprotected". That new behavior will not affect those who install MSE 4.5.216 under Windows Vista & Windows 7. Read here:answers.microsoft.com/en-us/protect/wiki/mse-protect_start/microsoft-security-essentials-452160-potentially/1328d67a-5720-4481-8662-e52a49a11a22

    Therefore, XP users should continue to use the previous version of MSE, v4.4.304.0.

  • Thank you so much for this information and updated URL.

  • Microsoft Security Essentials 4.6.305.0 Stable released.

  • Where can I get the offline installer of Windows Defender for Windows 8.1 Enterprise x64?

  • @Rajiv
    As far as I know, there is no offline installer of Windows Defender for Windows 8 because it is treated as a built-in application or a part of the OS itself. And as for the version updates, I believe that it has to be updated via Windows Update since there is actually no downloadable installer for it.

  • Microsoft Security Essentials is now updated to version

    please update the POST..

    Thanks VG !!

  • Need dates on both these comments and the last date the article has been updated. Otherwise, why risk getting an old version, wasting time. Also, a separate link to the latest updates would be helpful. I have Windows updater service off on several PCs, (to prevent auto-updating W8. to W8.1), and so, I can't use the standard updater to SE.

  • Correction --- I was thinking of Windows Defender, and not SE for Windows 8.x. It would be nice to have a link to that as well, which doesn't exist as per Paul above....

  • Is this installer of MSE 4.7 updated? I mean to ask that I don't need to update MSE after installing it?
    Internet speed is currently slow.
    Thanks in advance
    Windows 7 x64

  • Could someone explain WHY MSE Feature Pack blaaablaaablaakeeps popping up in Windows Update in recommended updates although I have Avast Antivirus installed. I hid it the last time and now it was back. Apparently some component in there doesn't recognize Avast at all. I wonder how many people have accidentally installed MSE alongside Avast and then started to experience all kinds of wonky donky stuff. Oh and this happens on ALL computers I have ever been involved with that have Avast Antivirus installed. Seen this roughly 150 times now.

  • Hey VG !!!
    Microsoft Security Essentials is updated to version
    please update the article..
    kEeP rOcKiNg

  • Please add a date to ALL your articles AND to comments.

  • I need this internet security for window 8.1 64 bits but I do not see any could you please tell me if Microsoft has it please .
    I would appreciate the help.
    Thank you.

  • Hey VG !!!
    updated version 4.9.0218.0 is out. Please update the article...Thanks !!!

  • Hey VG !!!
    updated version is out. Please update the article...Thanks !!!

  • VG

    ^^ That update caused problems to MSE users so Microsoft has pulled the update.

  • Hey VG !!

    Microsoft Security Essentials 4.10.0209.0 is out, please update the article


  • So, I haven't found any cosmetic changes in the app. And even under the hood. What is the update for? A new build number? Heh.

  • mse is the best. Its what to have when you dont need extra features like browsing protection, downloading installing protection, paranoia intensifier.. and so on :D... but when all you need is a scanner and realtime protection (which, for some, is really all you need) Then go with mse

  • Ok is there a link where I can offline download MSE v4.4.304.0 ? For XP sp3?

  • VG

    ^^ MSE is not available for Windows XP.

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