Before a suspicious program runs, Microsoft Security Essentials pretends to run it to determine what it's going to do. Dynamic signature is a way to check whether a suspicious program is bad or not. Protection needs to be up-to-date to be effective. If no firewall protection is present, you'll be given the option to turn on Windows Firewall. During setup, Microsoft Security Essentials scans the PC to determine if a firewall is active on the PC. Having an active firewall is part of securing your PC. Threats are categorized as Severe, High, Medium, or Low, and you can choose whether to ignore, quarantine or remove the item from the system. When Microsoft Security Essentials determines a possible threat on your PC, alerts notify you of the threat. Scheduled scans are turned on by default and configured to run weekly at 2 a.m. Microsoft Security Essentials offers complete system scanning capabilities with both scheduled and on-demand scanning options to provide an extra level of confidence. Alerts notify you when spyware, viruses, or other malicious software attempt to run or install on your PC, and suspicious files and programs are prevented from opening. Real-time protection means addressing potential threats before they become problems. Microsoft Security Essentials is built for individuals and small businesses, but it's based on the same technology that Microsoft uses to protect giant businesses (security products like Microsoft Forefront, the Malicious Software Removal Tool, and Windows Defender).

Microsoft Security Essentials offers award-winning protection against these intruders without getting in your way. There are a host of nasty intruders on the Internet including viruses, trojans, worms and spyware. MSE requires Windows 7, Windows Vista, or Windows XP. Your PC must run genuine Windows to install Microsoft Security Essentials. It's easy to tell if your PC is secure - when you're green, you're good. Microsoft Security Essentials is a free download from Microsoft that is simple to install, easy to use, and always kept up to date so you can be assured your PC is protected by the latest technology.

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