Definition Update for Windows Defender - KB915597 (Definition 1.3.

I have been trying to download this Definition Update for Windows Defender and despite many attempts it will still not get downloaded on my machine. Can anyone please help me out or show me another way to download this update on my pc. Any help will be appreciated. Thank you.

You should know that by default, Windows Defender is designed to install and run updates automatically. If you have disabled this feature or if you encounter problems updating automatically, you can manually download and install the latest Windows Defender definition updates for your computer. For more information, go to this website - http://www.microsoft.com/security/po...s/HowToWD.aspx

Well, I have seen that if you install any kind of antivirus software such as the AVG, Norton or Avast on your machine then the inbuilt windows defender gets disabled automatically. So what you can do is go to the control panel settings and then try to enable the windows defender and then try to update to the latest definition.

If you want to install the definition updates from a saved file then follow the below steps:

1. Click Start, click Documents, and then locate the folder where you saved the definition file.
2. Right-click mpas-fe.exe, click Run as administrator, and click Run. You might be asked for an admin password or to confirm your choice.