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Microsoft Security Essentials provides real-time protection for your computer against viruses, spyware, and other malicious software.
Features:

• Easy to install, easy to use and always up to date so you can be sure that your computer is protected with the latest technology.
• It works quietly and efficiently in the background, so you can use your Windows computer without interruptions and long wait.
• Before installing Microsoft Security Essentials, we recommend that you remove other anti-virus software that is already running on your PC. Running multiple antivirus programs at the same time can lead to conflicts that affect PC performance.