Protect your Windows 8.1 PC with Avast Free Antivirus
Your Windows 8.1 PC deserves an antivirus trusted by 435 million users worldwide.
Get your Windows 8.1 PC running smoothly
We’re more than just free antivirus. Avast also protects your Windows 8.1 PC’s performance, using cloud-based processing to secure you without slowing you down. In addition, you can optimize Windows 8.1 with Avast Cleanup, which will adjust settings, clear junk data, and clean out your registry to get your Windows 8.1 PC running as good as new.
Essential antivirus protection for Windows 8.1
Avast Free Antivirus has been tested on Windows 8.1 by AV Comparatives, who found we offer 100% protection against zero-day malware attacks. That, combined with our growing suite of security features such as Avast SecureLine and Avast Passwords, will ensure that no threat will put you or your PC at risk.
The people have spoken
Great protection of my laptop with Windows 8.1. Thanks!
Best antivirus on the planet!
Very good antivirus software. I like it doesn't slow down my computer and it's free.
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