Windows 11 antivirus

Windows 11 is coming, and we'll be ready! Download free antivirus for previous versions of Windows now. 

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How to use antivirus for Windows PCs

Full protection or simple cleanup?

The free version of Malwarebytes for Windows is great for getting rid of existing infections, but some infections, like ransomware, only need a moment to wreak havoc on your PC. To stop infections before they happen, stay one step ahead with the Real-Time Protection of Malwarebytes Premium.

  • Cleans up an already infected computer
  • Protects your identity and privacy from hackers
  • Protects your documents, financial files from ransomware
  • Protects you from malicious and fake websites
  • Stops malware that degrades computer performance
  • Crushes malware attacks that corrupt your programs
  • Suspends Malwarebytes notifications while you game
  • Brute Force and Uninstall Protection (Windows only)

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Malwarebytes Free

Cleans up an already infected computer

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Protects your identity and privacy from hackers

green check

Protects your documents, financial files from ransomware

green check

Protects you from malicious and fake websites

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Stops malware that degrades computer performance

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Crushes malware attacks that corrupt your programs

green check

Suspends Malwarebytes notifications while you game

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Brute Force and Uninstall Protection (Windows only)

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Don't take our word for it

“We use Malwarebytes on all of our company computers. Our experience is that Malwarebytes is effective and trouble free.”

‒ Robin G.

Fort Worth, TX

“Malwarebytes provides an extra, invaluable layer protection against malicious data, and that makes me and our systems feel safer!”

‒ Billy H.

Sarasota, FL

“Eliminating hundreds of potential malware and trackers every week for our entire organization.”

‒ Raymond P.

Southfield, MI

Don't take our word for it

“We use Malwarebytes on all of our company computers. Our experience is that Malwarebytes is effective and trouble free.”

‒ Robin G.

Fort Worth, TX

“Malwarebytes provides an extra, invaluable layer protection against malicious data, and that makes me and our systems feel safer!”

‒ Billy H.

Sarasota, FL

“Eliminating hundreds of potential malware and trackers every week for our entire organization.”

‒ Raymond P.

Southfield, MI

Windows 11 FAQ

Microsoft has announced that Windows 11 will be available beginning October 5, 2021. It will be available as a free upgrade for eligible PCs running Windows 10, or on new PCs that come with Windows 11 already installed. 

Microsoft has shared that some PCs will be able to upgrade to Windows 11 for free when it becomes available. They have a tool called the PC Health Check app that you can use to check if your current PC meets the requirements to run Windows 11. Minimum system requirements are also listed on their Windows 11 page

Historically, Windows PCs have been subject to many online threats such as computer viruses, computer worms, and other forms of malware. Today, threats like ransomware, cryptojacking, social engineering, and spyware pose threats to PCs. Consider the following Windows threat headlines from thus far in 2021: 

Vulnerabilities are regularly discovered in software, and there are bad actors out there willing to exploit them. Zero-day attacks are exploits of brand new vulnerabilities before the software developer knows about it or has a chance to fix it, and we see these in Windows, as noted in the stories above. As an operating system, Windows faces a lot of threats. To protect your PC, use security software that includes antivirus and anti-malware protection like Malwarebytes Premium. Doing so means your PC is protected against a wide range of today's online threats. 

Even in 2021, viruses are still persistent threats. A virus infection is harmful software triggered by performing common tasks such as opening an email attachment, launching an infected program, or viewing an ad on a malicious site. Viruses self-replicate by modifying or completely replacing files.

Viruses are a type of malware. Malware’s focus is all about making money off you. Although it can’t damage the physical hardware of your device or network equipment, it can steal, encrypt, or delete your data, alter or hijack core computer functions, and spy on your activity.

The best way to protect against a virus infection and malware is to use a legitimate antivirus and anti-malware solution such as Malwarebytes Premium that protects your PC against not just viruses but other threats, too. You can use our free version to manually scan and remove threats, but our paid version will regularly scan, clean, and block threats so you don't have to worry. It’s powered by artificial intelligence and machine learning to keep your PC safe.

A PC that has gotten infected with a virus or other type of malware often starts showing signs, although some types of malware stay more quiet and hidden. Signs that your PC may have been infected can include: 

  • Lots of pop-ups: They might encourage you to visit unusual sites or download unfamiliar software.
  • Frequent crashes: Your device can freeze or crash due to hard drive damage from a virus.
  • Mass emails being sent in your name: It can feel frustrating when a cyberthief sends mass emails in your name.
  • Your password suddenly changes: Unusual stuff happens, like a password change, that keep you from logging in.
  • Slow computer: If your computer suddenly starts running slowly, it could be a virus.
  • Your homepage is different: Your homepage defaults to a different website or you can’t reset it.

To check for a virus or malware on your PC, you can use Malwarebytes' free antivirus to scan and remove threats. To proactively protect your PC against these types of threats, consider subscribing to Malwarebytes Premium to ensure that your PC is protected regularly. 

Tech specs

Software requirements

Windows 10 (32/64-bit)

Windows 8.1 (32/64-bit)

Windows 8 (32/64-bit)

Windows 7 (32/64-bit)

Active Internet connection

hardware-requirements Created with Sketch.

Hardware requirements

800MHz CPU or faster, with SSE2 technology

2048 MB (64-bit OS), 1024 MB (32-bit OS)

250 MB of free hard disk space

1024x768 or higher screen resolution

Languages supported

Bulgarian, Chinese (Traditional), Czech, Danish, Dutch, English, Finnish, French, German, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese (Brazil), Portuguese (Portugal), Romanian, Russian, Slovak, Slovenian, Spanish, Swedish

Version

Click here to view our full history.

*The anti-ransomware protection component is only available on Windows 7 or higher.

Need support? Visit Malwarebytes for Windows support.

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