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Windows 7 32 bit; Definition Update for Windows Defender - KB915597 (Definition 1.197.2571.0) Failed I viewed my Windows Updates and found that the 'Definition Update for Windows Defender - KB915597 (Definition 1.197.2571.0) Failed on 5/15/15. How to download and install a Microsoft Windows Defender update: Check whether your version of Windows is 32-bit or 64-bit. In the table left, click on the link that will work for your version of.


Microsoft continually updates security intelligence in antimalware products to cover the latest threats and to constantly tweak detection logic, enhancing the ability of Microsoft Defender Antivirus and other Microsoft antimalware solutions to accurately identify threats. This security intelligence works directly with cloud-based protection to deliver fast and powerful AI-enhanced, next-generation protection.

Microsoft security intelligence updates include software that incorporates material from third parties. Third-party notices and information

Automatic updates

To help ensure your antimalware solution detects the latest threats, get updates automatically as part of Windows Update. If you are having problems with Windows Update, use the troubleshooter.

If you don't already use Microsoft Defender Antivirus, learn how to turn it on.

Trigger an update

A manually triggered update immediately downloads and applies the latest security intelligence. This process might also address problems with automatic updates. Microsoft Defender Antivirus and other Microsoft antimalware solutions provide a way to manually trigger an update.

Windows Defender

In Windows 10, select Check for updates in the Windows Security Virus & threat protection screen to check for the latest updates.

Enterprise administrators can also push updates to devices in their network. To clear the current cache and trigger an update, use a batch script that runs the following commands as an administrator:

Manually download the update

You can manually download the latest update.

Latest security intelligence update

The latest security intelligence update is:

  • Version: 1.353.2226.0
  • Engine Version: 1.1.18700.4
  • Platform Version: 4.18.2110.6
  • Released: 12/7/2021 1:56:22 PM
  • Documentation: Release notes

You need to download different security intelligence files for different products and platforms. Select the version that matches your Windows operating system or the environment where you will apply the update.

Note: Starting on Monday October 21, 2019, the Security intelligence update packages will be SHA2 signed.
Please make sure you have the necessary update installed to support SHA2 signing, see 2019 SHA-2 Code Signing Support requirement for Windows and WSUS.

Microsoft Defender Antivirus for Windows 10 and Windows 8.132-bit 64-bit ARM
Microsoft Security Essentials32-bit 64-bit
Windows Defender in Windows 7 and Windows Vista32-bit 64-bit
Microsoft Diagnostics and Recovery Toolset (DaRT) 32-bit 64-bit
System Center 2012 Configuration Manager32-bit 64-bit
System Center 2012 Endpoint Protection32-bit 64-bit
Windows Intune32-bit 64-bit

The links point to an executable file named mpam-fe.exe, mpam-feX64.exe, or mpas-fe.exe (used by older antispyware solutions). Simply launch the file to manually install the latest security intelligence.

End of life for Microsoft Forefront Client Security was on July 14, 2015. Customers are encouraged to migrate to System Center Endpoint Protection. For more information, visit the Microsoft support lifecycle website.

Network Inspection System updates

The following products leverage Network Inspection System (NIS) updates:

Windows defender windows 8 download 64 bit
  • Microsoft Security Essentials
  • Forefront Endpoint Protection
  • System Center 2012 Endpoint Protection

These updates are designed to protect you from network threats, including exploits as they are transmitted. Check the version of the Antimalware Client component on your security software and download the right version of the NIS updates for your platform.

4.1.522.0 and newerNetwork Real-time Inspection definitions32-bit 64-bit
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Windows Defender is the default antivirus in Windows 10 operating system. For the uninitiated, Windows Defender is more or less like Microsoft Security Essentials solution out there for Windows 7 and earlier versions.

Sep 05, 2019 Windows Malicious Software Removal Tool (MSRT) helps keep Windows computers free from prevalent malware. MSRT finds and removes threats and reverses the changes made by these threats. MSRT is generally released monthly as part of Windows Update or as a standalone tool available here for download.

Windows Defender in Windows 10 features

In Windows 7 and previous versions, the built-in Windows Defender was just a spyware remover. However, the Windows Defender in Windows 8 and Windows 10 helps you get rid of viruses, spyware, and malware as well. On top of that, Scan with Windows Defender context menu entry has been added in Threshold 2 Update so that users can quickly scan files and folders.

The Windows Defender in Windows 10 is configured to automatically download and install definition updates from Microsoft servers and requires no user intervention. The Defender gets definition updates via Windows Update service, and if you have turned off automate Windows Update for any reason, you need to manually update Windows Defender offline.

Definition updates for Windows Defender in Windows 10

If the Windows Defender is not automatically downloading and installing updates for any reason or if your PC is offline, you can manually download Windows Defender updates from Microsoft and then install updates with a click.

Here is how to download Windows Defender definition updates from Microsoft and install them on a Windows 10 PC.

Download and install Windows Defender updates offline in Windows 10

Windows Defender Windows 8 Download 32 Bit Full Version

NOTE: Usually Microsoft releases Windows Defender updates at least once a day, and recommends you download and install every day for good level of protection.

Step 1: Since Defender updates are separately available for 32-bit and 64-bit, before visiting Microsoft website, you need to check the type (32-bit or 64-bit) of your Windows 10 operating system.

To check if you’re running 32-bit or 64-bit Windows 10, right-click on the This PC icon in the File Explorer and then click Properties. Under System section, you will see type as 64-bit operating system or 32-bit operating system.

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Step 2: Visit this page of Microsoft, and scroll down. As you can see in the picture below, the webpage displays version of latest Defender definition updates as well as the date and time at which the update was uploaded.

Download either 32-bit or 64-bit updates depending on the type of Windows 10 installed on your PC. For Windows Defender in Windows 10, click the 32-bit or 64-bit link next to Windows Defender in Windows 10 and Windows 8.1 as shown in the picture below.

Windows Defender 32 Bit Download

The update file will be named as mpas-fe.exe, mpam-fe.exe, or mpam-feX64.exe.

Step 3: Once the update is downloaded, navigate to the folder containing downloaded files, double-click on the update file, click Yes button if you see the User Account Prompt to install the update.

The update will be installed in a few seconds.

If your Windows 10 is offline and you’re using Windows Defender instead of third-party tools, we recommend you update the Defender at least three days once if not possible to update every day.