Avast Free Antivirus for Windows is an essential security application that prevents viruses, spyware, and other malicious threats from infecting your PC.

This article contains instructions to download and install Avast Free Antivirus.

Install Avast Free Antivirus

1. Click the button below to download the Avast Free Antivirus setup file, and save it in a familiar location on your PC (by default, downloaded files are saved to your Downloads folder).
   Download Avast Free Antivirus for Windows
2. Right-click the downloaded setup file avast_free_antivirus_setup_online.exe and select Run as administrator from the context menu.

4. If prompted for permission by the User Account Control dialog, click Yes.
5. To change the default setup language, click the current language in the top-right corner of the screen. Then, click Install to proceed with default installation, or click Customize if you need to make changes to the default setup.
6. Wait while setup installs Avast Free Antivirus on your PC.
7. When the installation is complete, click Continue.
8. Click Run first scan to start a comprehensive Smart Scan, which detects viruses, malware, bad browser add-ons, and other issues on your PC.

Avast Free Antivirus is now installed on your PC and ready to use, but some components may not fully function until you restart your PC.

It is no longer necessary to register Avast Free Antivirus, as your initial free subscription automatically activates after installation.

Still need help?

If you experience any installation issues:

1. Ensure your PC meets the minimum system requirements and your Windows is up-to-date.

2. Check that the downloaded setup file is not corrupted. For instructions, refer to the following article:
   • Troubleshooting installation errors caused by corrupted setup files
3. Uninstall any previous antivirus software from your PC. For instructions, refer to the following articles:
   • Uninstalling other antivirus software
   • Using the Uninstall Utility for Avast Antivirus
4. Restart your PC, then try to install Avast Free Antivirus again by following the exact steps in this article.

If the issue persists, contact Avast Support and provide your setup log file. For instructions, refer to the following article:

• Getting the setup log file if Avast Antivirus fails to install

Further recommendations

• For more information about Avast Free Antivirus, refer to the following article:
  • Avast Premium Security and Avast Antivirus for Windows - Frequently Asked Questions