Description: This article will show how to check for virus definition updates for Windows Defender in Windows 10. Note: If there is another antivirus installed on the computer, Windows Defender will automatically be disabled and these options cannot be accessed.

1. Select the Start button at the lower left corner of the screen, then choose Settings.
   
2. Choose Update & Security.
   
3. On the left, select Windows Defender, then select Open Windows Defender.
   
4. Once in the program, select Update.
   
5. Choose Update definitions. It will begin to update and apply any downloaded updates automatically.