Antivirus Windows 8.1

If you're using a non-Microsoft antivirus/antimalware product on your device, you might be able to run Microsoft Defender Antivirus in passive mode alongside the non-Microsoft antivirus solution. It depends on the operating system used and whether your device is onboarded to Defender for Endpoint. To learn more, see Microsoft Defender Antivirus compatibility.

If you're using Application Control for Windows, or you're running non-Microsoft antivirus or endpoint detection and response software, make sure to add the processes mentioned earlier to your allow list.

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Passive mode means Microsoft Defender Antivirus running, but is not the primary antivirus/antimalware product on your device. Passive mode is only available for devices that are onboarded to Microsoft Defender for Endpoint and that meet certain requirements. To learn more, see Requirements for Microsoft Defender Antivirus to run in passive mode.

Performance tip Due to a variety of factors (examples listed below) Microsoft Defender Antivirus, like other antivirus software, can cause performance issues on endpoint devices. In some cases, you might need to tune the performance of Microsoft Defender Antivirus to alleviate those performance issues. Microsoft's Performance analyzer is a PowerShell command-line tool that helps determine which files, file paths, processes, and file extensions might be causing performance issues; some examples are:

It's important to keep Microsoft Defender Antivirus (or any antivirus/antimalware solution) up to date. Microsoft releases regular updates to help ensure that your devices have the latest technology to protect against new malware and attack techniques. To learn more, see Manage Microsoft Defender Antivirus updates and apply baselines.

With Bitdefender Antivirus Free for Windows you have permanent access to award-winning technologies that keep you safe from viruses and cyber threats. No need to worry about availability, you will be able to use the free antivirus protection without any validity due date.

Unexpected pop-ups, unfamiliar apps running in the background, slowdowns, and random sounds are some signs that your laptop or PC might be compromised. If you experience any of these, the best way to check your device for viruses is to use a dedicated antivirus for Windows.

Download Bitdefender Free Antivirus for Windows and benefit from real time protection for your laptop or PC. This free antivirus includes a powerful virus scanner which instantly detects and blocks viruses and e-threats on your Windows devices. If you need to make sure that your device is safe, the virus cleaner module will keep any threat at distance at all times.

Bitdefender Antivirus Free is a free antivirus software especially designed to protect your Windows PC. Quick to install and light on computer resources, it is good for gaming, image and video editing, and resource-intensive applications.

Windows 11 lets you run the antivirus program of your choosing, and Bitdefender Antivirus Free for Windows is the perfectly optimized option if you need a powerful antivirus software loaded only with the bare-bones protection features that every computer needs.

To a degree, yes. Some antivirus programs can do things like warn you or block you from visiting a suspected phishing site. Others may also automatically block suspicious emails that appear to come from a malicious sender or contain phrasing common in phishing emails. However, you cannot count on an antivirus program to be a failsafe solution for phishing protection. You still need to be vigilant and know what to look out for on your own when it comes to phishing, because an antivirus program won't be able to catch everything.

Any program running on your computer will require a certain amount of processing power to work, which can affect your computer's overall performance. If an antivirus program is just running in the background, it shouldn't really have any effect on your computer's performance. However, when actively running a scan of your system, antivirus software can noticeably slow down your computer. If this is the case, try to schedule antivirus scans at night, or at a time when you're not using your computer.

There is a common misconception that Macs are inherently immune to malware. But as Macs continue to increase in popularity, they're increasingly attractive targets for cybercriminals looking to deploy malware designed for the MacOS operating system. MacOS has a built-in antivirus solution called XProtect that can detect and remove malware. It works in the background and updates automatically to keep up with the latest threats, but it still may not catch everything that a third-party antivirus program will. So if you want to play it safe and boost the malware protection on your Mac, it's a good idea to add a third-party antivirus solution.

Antivirus software runs virus scans for known viruses and malware, watch for shady websites, offer ransomware protection and monitor unexpected behavior that may be a sign of new viruses and malware. You want antivirus software that can successfully identify these unknown online threats without flagging too many false positives.

You don't want antivirus software that taxes your PC's resources. If after you install the program, websites open slowly, apps download or open sluggishly or file copies take longer than expected, you may want to try another service.

Before you buy, check for discounts on a company's website. Another way to save: The prices we list above are for 10 devices -- if the company offered that package -- but you can trim your cost with antivirus packages if you need to cover three or five devices.

If you practice safe computing -- that is, you keep your software up to date, you use strong passwords (with the help of a password manager), you steer clear of unsolicited emails and you don't click suspicious links that may be phishing attempts -- you probably can avoid zero-day attacks and ransomware attacks. And with the free Microsoft Defender Antivirus software running on your Windows PC, you have a malware protection safety net if you do let your guard down. In fact, it is one of the best antivirus software options. 

(Note: Microsoft changed the name of Windows Defender to Microsoft Defender and has expanded the service to other platforms.) This free antivirus program is built into Windows, and it's turned on by default, the antivirus engine does its thing, and this antivirus solution will cover the basics of internet security. Microsoft pushes new updates frequently. Defender also lets you tune the level of protection you want, giving you control over blocking potentially unwanted apps and protecting folders and files from a ransomware attack. 

Windows 10 and 11 will automatically disable its own Windows Defender antivirus when you install third-party antivirus. If you uninstall the third-party protection, Windows will turn on its own antivirus again.

Windows 10 and 11 will automatically disable its own Windows Defender antivirus when you install third-party antivirus. If you uninstall the third-party protection, Windows will turn on its own antivirus again.

NortonLifeLock has consistently earned high marks from AV-Test, AV Comparatives and SE Labs for virus and malware detection. Norton antivirus provides excellent security software for PC, Mac and mobile devices. The company's products include Antivirus Plus, Norton Secure VPN, Norton 360 for Gamers, Norton 360 with LifeLock Select and more. A 10-device subscription for Norton 360 with LifeLock Select is normally $180 per year, but you can get your first year for $80 off. In addition to malware and virus protection for your computer and mobile device, this security suite provides 100GB of backup to the cloud, safe-browsing tools, a secure VPN, password manager, parental controls and LifeLock identity theft protection and fraud alert. While not all of those services are necessarily best in their respective class, getting them all in one package is a compelling option. Topping it off, Norton offers a free seven-day test drive of the suite, as well as a full refund "within 60 days of purchase for annual subscriptions and within 14 days of purchase for monthly subscriptions," according to Norton's site. ff782bc1db