Microsoft Windows 8 has a built in antimalware, antivirus solution called Windows Defender. Windows Defender will be turned on by default for all Windows 8 machines. But if you want to use any other antimalware solutions like Norton, AVG, etc, Windows Defender can be turned off. To make this experience better, Microsoft is working with Antimalware companies to make their apps run better on Windows 8.
Microsoft is actively working with antimalware app developers, including those listed on this page, to ensure the availability of high-quality antimalware apps on Windows 8.
The companies listed below provide prerelease antimalware apps that they have developed to work with Windows 8 Release Preview. To find a business-oriented antimalware app that is compatible with Windows 8 Release Preview, visit the Windows 8 Release Preview Compatibility Center or contact your antimalware app developer of choice.
Some other companies might offer products that appear to be antimalware apps, but when you install the app, you might also be installing viruses or malware on your PC without knowing it. You should carefully investigate the source of any apps, including antimalware apps, before downloading and installing them.
Check out Microsoft’s Antimalware partners here.