Protect your Windows 11 PC with advanced features
Get essential free protection
Enjoy safer shopping and banking online
Enjoy top performance
Get award-winning antivirus for Windows 11
Avast has earned many accolades, but the best reward is the loyalty of our 435 million users. We enjoy serving the largest community of any antivirus company in the world — and we’re thrilled to continue to protect you when you upgrade your PC to Windows 11.
Enjoy all-around, effortless protection
We’re proud to protect millions of Windows PCs. But you don’t have to take our word for it. Check to see how many PCs we’ve protected this week alone:
Avast prevented virus attacks on Windows PCs in the past week.
Avast prevented %tagStart1%virus%tagEnd1% attacks on Windows PCs in the United States just last week.
The United States’ Windows 11 PCs are the third most attacked in the world.
The number of attacks prevented against Windows PCs in the past 30 weeks
Already have Avast? We’ve got you covered
If you’re upgrading from older versions of Windows, such as XP, Vista, 7, 8,8.1, 10, you can keep your new Windows 11 PC virus-free. Make sure you’re running the latest version of Avast before you upgrade. Once you’ve transitioned to Windows 11, you can browse the internet with complete confidence, knowing that both your online security and computer are in safe hands.
How to install Avast Free Antivirus for Windows 11
What our customers have to say
Is Avast Free Antivirus compatible with Windows 11?
Does Windows 11 need an antivirus?
This antivirus can detect any security weaknesses in real time and blocks viruses, spyware, Trojans, and other types of malware — all completely free.
Is it safe to upgrade to Windows 11?
To make your PC safer, we recommend using an effective free antivirus to add an extra layer of online security and a secure VPN to encrypt your connection for greater privacy.
Does Windows 11 have better security than older versions?
You can combine the new security features with antivirus software to make your PC even more secure. Avast Free Antivirus can make sure malicious websites and vulnerable Wi-Fi networks don’t jeopardize your online safety. It also includes advanced features like web and email shields, Wi-Fi security scanners, and more.
Will Avast Free Antivirus affect the performance of your Windows 11 PC?
You can boost the performance of your PC further by using our cleanup tool to clean up, speed up, and tune up your device.