Update Windows Defender manually in Windows 10 / 8

Windows Defender in Windows 10 or Windows 8.1 is set to automatically download and install the definition updates using Windows Update, once a day. If for some reason, your Windows Defender will not update automatically, or if you wish to download and save the definition updates in order to maybe update Windows Defender offline, on different installations of Windows 8, then this post will be of interest to you.

We have already seen how to download Windows Update manually. Today, we will see how you can update Windows Defender manually.

Update Windows Defender manually

First check whether you are using a 32-bit or 64-bit version of Windows 8. Once you know the version of Windows 8 installed on your device, download the installers from the following links:

Download definition updates for Windows Defender in Windows 8 & Windows 8.1: 32-bit | 64-bit | ARM.

Update Windows Defender manually in Windows 8
Once the file has finished downloading, go to your download location and double-click the file mpamfe.exe. Follow the prompts to install the update.

You can also update Windows Defender definitions using Windows PowerShell.

If you think some malware is preventing the installation of Windows Defender definition updates, you may want to run a scan with Microsoft Safety Scanner or for more stubborn malware, using Windows Defender Offline.

See how to update Windows 10 offline.

These links are sure to interest you too:

  1. Update Windows Defender even when Automatic Windows Updates is disabled in Windows 10 / 8 / 7
  2. Fix: Windows Defender is turned off or not working
  3. Fix: Unable to turn on Windows Defender in Windows 10 / 8 / 7
  4. Add Scan With Windows Defender To Context Menu In Windows 10 / 8 / 7.
Posted by on , in Category Security with Tags
Anand Khanse aka HappyAndyK is an end-user Windows enthusiast, a Microsoft MVP in Windows, since 2006, and the Admin of TheWindowsClub.com. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.
  • mmg1818

    download and open but no open.

    win 8.1 pro original

  • http://www.thewindowsclub.com Anand Khanse

    I have mentioned the links for Windows Defender in Windows 8. It worked on my Windows 8.1 Pro 64-bit. Please confirm that your Windows Defender is not disabled, check your version and download again.

  • Jennie

    Can these be used for Windows Defender on Windows 7 too?

  • http://www.thewindowsclub.com Anand Khanse
  • Samit Tandukar

    windows defender in windows 8/8.1 is great but I don’t like the fact that they don’t have context menu….

  • http://www.thewindowsclub.com Anand Khanse
  • Samit Tandukar

    can we do specific drive or folder scan with like that….

  • loko ligdi

    how about for window 8

  • Manjunath Rampure

    Do I need to install defender updates? I am using Norton antivirus.

  • http://www.thewindowsclub.com Anand Khanse

    No you don’t need to.

  • Adjie

    work :) syukron

  • Nshimiye Andrew

    How do i update window defender in mi pc.Am using windows 7 ultimate

  • http://www.thewindowsclub.com Anand Khanse

    If your Windows Update is set to ‘Automatic’, it will update Windows Defender too.

  • omi

    i have downloaded the file as per my system requirments but file can not run pls tell me what to do

  • santhan

    how to update windows defender in windows 8?

  • sosa

    do i need to install defender updates? I am using avast antivirus

  • http://www.thewindowsclub.com Anand Khanse

    Defender will disable itself if you have Avast installed. No you do not need to update Defender. Should you wish to, you will have to disable Avast, activate Windows Defender and then update it. After that you can activate Avast again.

  • Mandy

    Now trying it will work right

  • Janith

    It worked perfectly. Thanks loads..

  • charles

    Do I need to install any antivirus?
    I’m using windows defender.

  • http://www.thewindowsclub.com Anand Khanse

    If you have safe browsing habits, then Windows Defender on Windows 8 should be good enough.

  • charles

    Great. Thanks alot

  • http://thewhizzer.blogspot.com/ Buck

    Well I would also install a good antivirus besides defender also Malawarebytes

  • charles

    Which is the best antivirus to install?

  • charles

    Right. I need some clarifications please.
    What do you mean by good browsing habbits?

  • http://www.thewindowsclub.com Anand Khanse

    Some free options here: http://www.thewindowsclub.com/recommended-free-anti-virus-software-for-windows-7 BitDefender Free is good imo.

  • http://www.thewindowsclub.com Anand Khanse

    It means, generally not visiting sites with poor reputations, being careful where you click, and so on. :)

  • http://thewhizzer.blogspot.com/ Buck

    It depends what you do on the net I think Anand

  • charles


  • KI-34

    if you don’t mind, could you teach me how to update windows defender manually with skype ?


  • acornbuilder

    Hi could you PLEASE help with Defender problem? Will not initialize – error 0x80073b01. I cannot seem to find any posts that give a direct answer. Most request I download anti-malware and I have run scan after scan with no joy. I am at a complete loss.

  • Veasna Yim

    Dear Sir,
    Our PCs are domain member and when I configured the scheduled “update and scan”,i need to log on to Local Administrator to do that on each machine
    This is my questions,
    1-If a client log on to those computer under their own active directory account on those machines , will the Windows Defender run schedule scan or updated as we have configured on Local Administrator ?

    Best Regards,

  • Aliza arif

    m using window 8.1 but defender is not working what should i do now?

  • rajesh

    PLZ ANY ONE HELP MI in my lapi some softwares coming automatically and even installed on my desktop like mybar search so many number of times I have deleted from my control panel again there wrere coming in applications.and windows defender is not woring even I had uninstalled avast antiviruesss.plzz help mi frm this prblm

  • Arthur

    The phrase, “don’t put all your eggs into one basket” provides a good lesson when dealing with anti-virus software. If I am working in a corporate infrastructure I will employ at least two different virus scanners – one on the server side, and a different one on the end-user desktops. Adopting this method means that the chance of me being caught by a false-possitive instance (where anti-virus updates report software as being infected) is dramatically reduced.

    I have run Security Essentials since it appeared in beta, and later-on migrated to Defender. But once a month I will use the ESET On-Line Scanner to scan my machines for any malware that has been missed. Thankfully over the past couple of years I have only found 3 threats, which were all fresh releases so they hadn’t been caught by the definition updates.

    Always build a system with a 64bit (x64) operating environment, and always install x64 based software on your x64 system. Whilst this provides additional security it also allows you full access to the memory installed.

    If you are running a Windows environment, nearly all the solutions that you need are built into the system, you just need to learn how to manage them.

    For example, if you are running Win 8x or Win 10 then you do NOT need to install Adobe PDF Reader because Microsoft have an inbuilt solution. True it may not be pretty, but it does work well. If you are running Edge then you do not need to install Flash Player. The removal of these two pieces of software alone will significantly reduce your potential to gather viruses

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