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Windows Defender for Windows 8.1 and Windows RT 8.1 provides built-in protection against malware.
You can't use Microsoft Security Essentials with Windows 8.1, but you don't need to — Windows Defender is already included and ready to go. But if you’re looking to protect a PC with an older version of Windows, you can use Microsoft Security Essentials to help guard against viruses, spyware, and other malicious software.
Microsoft Security Essentials is available in many locales and languages. If it is not available in your preferred language, you can install it in any of the other languages listed here, and it will still work to help protect your PC. To download Microsoft Security Essentials, choose your preferred locale or language from the list that follows in below download button . Next, choose your operating system to begin the download process
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