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Even in , 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. 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.

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:. 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.

Malwarebytes Premium now protects PCs running Windows To learn more about Windows 11 and security, read our article: Windows 11 is out. Is it any good for security? Click here to view our full history. Need support? Visit Malwarebytes for Windows support. See pricing. The official Malwarebytes logo The official Malwarebytes logo in a blue font. By the numbers. Installations of Malwarebytes every day. Malwarebytes scans every month. Threats detected or blocked every day by Malwarebytes.

Malwarebytes Business Enterprise-grade protection and remediation for organizations large and small. Learn More. Malwarebytes Personal Premium protection and privacy for your home computers and devices.

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What are the symptoms of viruses and malware? If your computer has gotten a virus or malware infection, there are some telltale signs, including: Slow : Your computer slows down significantly.

Pop-ups : You have started to see a lot of unexpected pop-ups. Settings changed : Device or browser settings change without you changing them. Files encrypted : Ransomware has locked you out of your files or your entire computer. Block intrusive ads in Safari with Ad Blocking. On iPhones, ignore suspicious texts with Text Message Filtering. After the online virus scan, Malwarebytes reports on any threats that were found and asks if you want to remove them.

Once you give the ok, our virus removal tool will clean up threats so your device, files, and privacy are secure. Our experience is that Malwarebytes is effective and trouble free.

Free antivirus can be a good starting point to protect your devices. Malwarebytes offers free versions to scan and clean viruses and malware from your devices. Paid antivirus software like Malwarebytes Premium gives you on-going protection against viruses and malware, rather than just scanning and cleaning when you think your device might be infected. Malwarebytes security software has multiple layers of malware-crushing tech, including virus protection. Malwarebytes prevents threats in real-time, crushes ransomware, defends against harmful sites, and cleans and removes malware.

Go beyond antivirus and stop worrying about online threats. Traditional antivirus examines file signatures and compares them to a list of known viruses.