If your computer is running Windows 8
If your computer is running Windows 8, you already have antivirus software. Windows 8 includes Windows Defender, which helps protect you from viruses, spyware, and other malicious software.
If Windows Defender is turned off and you don’t have another antivirus program installed (or your other antivirus program is not working), you will see a warning in the notification area on your taskbar.
If your computer is running Windows 7
Windows 7 includes spyware protection, but to protect against viruses you can download Microsoft Security Essentials for free.
To find out if you already have antivirus software:
Open Action Center by clicking the Start button , clicking Control Panel, and then, under System and Security, clicking Review your computer’s status.
Click the arrow button next to Security to expand the section.
If Windows can detect your antivirus software, it’s listed under Virus protection.
Windows doesn’t detect all antivirus software, and some antivirus software doesn’t report its status to Windows. If your antivirus software isn’t displayed in Action Center and you’re not sure how to find it, try any of the following:
Type the name of the software or the publisher in the Search box on the Start menu.
Look for your antivirus program’s icon in the notification area of the taskbar.
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