Windows Defender Latest Definition Updates will help you install the latest Windows Defender definition updates.


If you encounter problems while trying to install definition updates for Windows Defender, you can download the latest definition update for computers running a 32-bit (x86-based) or 64-bit version of Windows.

How to manually install update definitions and verify Windows Update files
Microsoft delivers Windows Defender updates through Windows Update, through Automatic Updates, and through Windows Server Update Service (WSUS). In some cases, you might receive error messages because of problems with these services instead of with problems with Windows Defender. To try to determine the source of the problem, first try to manually install the update definitions. If you can manually install the update definitions, the problem is most likely caused by a Windows Update problem.


Step 1: Restart your computer if necessary

Switch back to Windows Defender and note the error code on the Home page. If the error message that you received in Windows Defender contains code 0x80240016, restart your computer. If the error message that you received in Windows Defender does not contain 0x80240016, go to Step 2.


Step 2: Manually install the update definitions

To manually install the update definitions, follow these steps:

1. Visit the Security Portal at one of the following Microsoft Web sites.

2. Follow the steps on the Web site to download and install the appropriate definition updates.

3. If you cannot install the definition updates manually or if you still receive error messages about definition updates in Windows Defender, some other things are occurring that are beyond the scope of this article. If this is the case, you might want to ask someone you know for help, or you might want to contact Microsoft support.

4. If you were able to manually install the update definitions, the problem is most likely caused by a Windows Update problem. Therefore, you should continue with Step 3.



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