Avast Free Antivirus is an essential security software that prevents viruses, spyware, and other malicious threats from infecting your PC.
Install Avast Free Antivirus
- Log into Windows as a user with administrator permissions and ensure no other application or antivirus software is running on your PC.
- Click the button below to download the Avast Free Antivirus setup file, and save it in a familiar location on your PC (by default, all files are saved to your Downloads folder). Download Avast Free Antivirus
- Right-click the downloaded setup file
avast_free_antivirus_setup_offline.exeand select Run as administrator from the context menu.
- If prompted by the User Account Control dialog for permissions, click Yes (or Continue on older versions of Windows).
- To change the default setup language, click the current language at the top-right corner of the screen. Then click Install to proceed with default installation.
- To change the default setup language, click the current language at the top-right corner of the Avast Setup screen. Select Customize to proceed with custom installation.
- Click Change to manually select your preferred location for saving Avast Free Antivirus program files, then select or deselect program components to install, and click Install.
- Wait while setup installs Avast Free Antivirus on your PC.
- Click Continue on the screen below the message You're protected.
- Review the Avast Privacy Policy and click Continue.
- If prompted to protect your mobile device, use the relevant options according to your preference, or click the
Xicon to close the screen.
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. The Avast user interface is accessible via the 
Avast system tray icon on your Windows taskbar or the Avast Free Antivirus icon on your desktop.
It is no longer necessary to register your Avast Free Antivirus as your initial free license automatically activates after installation. For more information, refer to the following article:
Troubleshooting
If you experience any installation issues:
- Ensure your PC meets the minimum system requirements and your Windows is up to date.
- Windows 10 except Mobile and IoT Core Edition (32 or 64-bit); Windows 8/8.1 except RT and Starter Edition (32 or 64-bit); Windows 7 SP1 or higher, any Edition (32 or 64-bit); Windows Vista SP2 or higher, except Starter Edition (32 or 64-bit); Windows XP SP3, any Edition (32-bit)
- Windows fully compatible PC with Intel Pentium 4 / AMD Athlon 64 processor or above (must support SSE2 instructions)
- 256 MB RAM or above
- 2 GB free space on the hard disk
- Internet connection is needed to download, activate, and maintain updates of the program and antivirus database.
- Optimal standard screen resolution no less than 800 x 600 pixels is recommended.
- Check that the downloaded setup file is not corrupted. For instructions, refer to the following article:
- Uninstall all your previous antivirus software from your PC. For instructions, refer to the following articles:
- Restart your PC, and try again to install Avast Free Antivirus by following the instructions in this article.
If the issue persists, contact Avast Support and provide your setup log file. For instructions, refer to the following article:
- Avast Free Antivirus 18.x
- Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
- Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1, 32 / 64-bit
- Microsoft Windows Vista Home Basic / Home Premium / Business / Enterprise / Ultimate - Service Pack 2, 32 / 64-bit
- Microsoft Windows XP Home / Professional / Media Center Edition - Service Pack 3, 32-bit