Protect Your PC with Avast Free Antivirus for Windows
Hundreds of millions of users worldwide trust Avast. Get our free, award-winning protection against viruses and other malware for Windows now.
Award-winning antivirus for Windows
Avast has earned many accolades, but the best reward is the loyalty of our hundreds of millions of users. We enjoy serving the largest community of any antivirus company in the world — and we’re thrilled to continue protect you when you upgrade your PC to Windows .
Protection that goes above and beyond
Windows provides very basic protection. Avast Antivirus secures not only your PC, but your entire home network as well — and it comes with advanced features such as Software Updater, Do Not Disturb Mode, and more.
Official partners with Microsoft
With Avast and Microsoft in your corner, there’s not much that can get in your way. When Microsoft supports Avast Antivirus on all Windows machines, it sends a clear message: we’re respected for what we do. That’s why industry experts like PC Magazine and PC Advisor rate us highly too.
No slowing you down
We’re proud to be called the "Antivirus with the lowest impact on PC performance” by AV Comparatives. Whether you use your PC for gaming or for work, Avast gives you the biggest protection in the smallest package possible
It’s free forever
Get advanced Windows antivirus protection against online threats like viruses and other malware. But we don’t stop there. We offer extra security features such as behavior shield, remote assistance, browser cleaning and more — yep, you guessed it — completely free.
Already have Avast? We’ve got you covered
If you’re planning on upgrading from older versions of Windows, such as 7, 8, 8.1 or 10, we’re ready to keep your new Windows 11 PC virus-free. Just make sure you’re running the latest version of Avast before you upgrade your machine and when you finish the transition to Windows 11, you’ll find us there, right where you left us, ready to protect your PC and everything in it that you hold dear.
The people have spoken
I have used Avast for a few years. The protection is the best for the money. I also cover my phones with Avast and I haven’t had any problems yet.
Carol J.
2023-09-12
I have used Avast for many years. The reason is very simple: you offer a great free version that actually works. This lets me afford the other amazing services you offer when needed, like Avast Cleanup.
James M.
2023-08-29
I've used Avast Free Antivirus on my computers, tablets, and smart phones for many years. It updates frequently and automatically. It automatically scans and protects me from malicious web sites. It does what I need. What more could I ask?
OB
2023-06-10
System requirements
PC with Windows 11, 10, 8.1, 8, or 7 (both 32-bit and 64-bit versions, excluding Starter and RT editions), 4 GB RAM, and 2 GB of hard drive space (ARM chips Windows 11 only)
© 2025 Gen Digital Inc. All rights reserved.
Almost Done!
Complete installation by clicking your downloaded file and following the instructions.
Initializing download....
Note: If your download did not start automatically, please click here.
Need Help? Please call 855-745-3255