Protect Your PC with Avast Free Antivirus for Windows
Over 435 million users worldwide trust Avast. Get our free, award-winning protection against viruses and other malware for Windows now.
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Using Windows 8.1? Download this instead
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Award-winning antivirus for Windows
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 protect you when you upgrade your PC to Windows .
Get the best Windows antivirus
Protection that goes above and beyond
Official partners with Microsoft
No slowing you down
It’s free forever
Already have Avast? We’ve got you covered
If you’re planning on upgrading from older versions of Windows, such as XP, Vista, 7, 8 or 8.1, we’re ready to keep your new Windows 10 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 10, you’ll find us there, right where you left us, ready to protect your PC and everything you hold dear in it.