Protect your Windows 8.1 PC with Avast Free Antivirus

Your Windows 8.1 PC deserves an antivirus trusted by hundreds of millions of users worldwide.

Free download

{trustComment}

{trustReviews} reviews on

{trustComment}

{trustReviews} reviews on

Free download

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.

Microsoft-approved security for Windows 8.1

Avast is one of Microsoft's official consumer security software providers – ensuring our place as one of the most beloved, trusted antiviruses on the net, used by hundreds of millions of users around the globe.

The people have spoken

Great protection of my laptop with Windows 8.1. Thanks!

Marshall L.

You may still be wondering...

FAQs

Every PC needs protection and Windows 8.1 PCs are no exception. Windows 8.1 does have built-in security software, however, it is widely accepted that this built-in security is not enough. Therefore for better online security, you need a third-party antivirus to keep you safe from viruses, ransomware, and other malware.

Windows 8.1 does have Windows Defender built-in, however, it only offers basic protection to Windows 8.1 PCs. Therefore, for true online security, it would benefit you and your device to invest in third-party antivirus software that can make up for the limitations of Windows Defender.

Yes. Windows Defender is free, as it comes built-into Windows 8.1. However, if you’re looking for more comprehensive security software, Avast offers a free antivirus for Windows 8.1. The free version of Avast Antivirus for Windows 8.1 provides powerful and comprehensive protection that should more than suffice for your needs. If you would like more security, however, you can also download a 30-day free trial of Avast Premium.

Avast Free Antivirus for Windows is one of the best Windows antiviruses by far due to our powerful security and additional features. We use six layers of security to ensure you have protection from 0-day threats. Additionally, our automatic spyware removal tool can keep your data private, and we make removing viruses already on your Windows 8.1 PC easy. Best of all, we’re absolutely free, so you can download and install our protection without paying anything.

Visit our Support Center for more FAQs

How to install

Get protected right away by following these 3 easy steps:

Step 1

1. Download

Click here to download.

Step 2

2. Open the file

Open the downloaded file and approve the installation.

Step 3

3. Install the file

Run the installer and follow the simple instructions.

System requirements

You can use Avast on most devices, not just the newest or most expensive. All you need is a PC with 256 MB+ RAM and 1.5 GB of hard disk space. If your Windows 8.1 PC has that (which it very likely should), you’ll be good to go.

Avast Antivirus is compatible with Windows 11, 10, 8.1, 8, and 7. Avast also offers you security solutions for your Android and Mac.

Almost Done!

Complete installation by clicking your downloaded file and following the instructions.

Protect your Windows 8.1 PC with Avast Free Antivirus

Get your Windows 8.1 PC running smoothly

Essential antivirus protection for Windows 8.1

Microsoft-approved security for Windows 8.1

The people have spoken

Very good antivirus software. I like it doesn't slow down my computer and it's free.

fred

Great protection of my laptop with Windows 8.1. Thanks!

Marshall L.

Best antivirus on the planet!

Jessie

Very good antivirus software. I like it doesn't slow down my computer and it's free.

fred

Great protection of my laptop with Windows 8.1. Thanks!

Marshall L.

You may still be wondering...

FAQs

Does Windows 8.1 need an antivirus?

Does Windows 8.1 have Windows Defender?

Is there a free antivirus for Windows 8.1?

What makes Avast one of the best antiviruses for Windows 8.1?

How to install

1. Download

2. Open the file

3. Install the file

System requirements