This article explains how to protect Windows 8 PCs against viruses. You install antivirus software to protect your computer from viruses. The antivirus software helps to update the system from the threats. Antivirus software is not free. If you want to use a free antivirus then Microsoft provides the "Windows Defender" for scanning the Windows so it is available by default in Windows 8.
Windows Defender is also available for previous versions of Windows and is a part of Windows Vista and Windows 7, but Windows Defender in versions of Windows previous to Windows 8 is not the same thing that is available in Windows 8. The software that is called Windows Defender in Windows 8 is called "Microsoft Security Essentials" in Windows previous to Windwos 8. Confusing? Very confusing; Microsoft seems to like to confuse us.
Windows Defender helps protect your System from viruses. It helps your System and keeps it up-to-date with protection. You can open the Windows Defender with the help of Control Panel. First you can open the Control Panel by typing the Control Panel in the Search box. After opening the Control Panel, you click on the Windows Defender and then follow the steps. These are given below.