![How to Resolve ‘Virus Definitions Update Failed’ in Avast Antivirus FIX Windows 10/8/7 [Tutorial]](https://ytimg.googleusercontent.com/vi/JkHy7imxzt8/0.jpg)
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Avast Antivirus uses a database of known Virus definitions to identify malware and other threats on your PC, which is why it is important to ensure the Virus definitions are regularly updated. The application refers to the user interface and all components in Avast Antivirus. Updates to the application provide bug fixes and general improvements.
By default, Avast Antivirus is set to update the Virus definitions and application automatically whenever a new version is available. We strongly recommend you keep automatic updates enabled.
This tutorial will apply for computers, laptops, desktops, and tablets running the Windows 10, Windows 8/8.1, Windows 7 operating systems. Works for all major computer manufactures (Dell, HP, Acer, Asus, Toshiba, Lenovo, Samsung).
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