Does Windows come with a virus protection program?
This page provides information about virus protection in Microsoft Windows.
Versions of Windows previous to Windows 7 did not provide virus protection as part of the operating system.
Windows 10
Windows 10 includes Microsoft Defender, a robust and efficient virus protection system. It is updated as necessary on a weekly basis by Microsoft as part of Windows Update. For reliable virus protection integrated directly into the OS (Operating System), keep Microsoft Defender enabled on your Windows 10 computer.
Windows 7 and 8 virus protection
MSE (Microsoft Security Essentials) was virus protection software for Windows 7 and 8. It was discontinued on January 14, 2020, and replaced by Microsoft Defender in Windows 8. More information is available at Microsoft's website.
Windows 3.11 virus protection
Windows 3.11 did include a basic virus protection program (msav). However, this program is no longer updated and is considered out-of-date and should not be used to protect your computer against viruses.
Bundled virus protection
Some computer manufacturers (OEMs) provide bundled software with their computers, which often includes an antivirus program (e.g., McAfee or Symantec). Although these programs help keep your computer protected against viruses, make sure it is not a trial version of the program. Many manufactures only include a trial of the virus scanner, which means the program stops working after 14 or 30 days.
Once the trial has expired, you must purchase a new license or uninstall the antivirus program and install a different antivirus program.