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.
Microsoft Security Essentials runs quietly and efficiently in the background so you're free to use your Windows-based PC the way you want-without interruptions or long computer wait times.
Note: *Your PC must run genuine Windows to install Microsoft Security Essentials.
Features and Benefits:
Here are some ways Microsoft Security Essentials helps keep your PCs safe without getting in your way or making you worry.
Real-time protection:
Real-time protection means addressing potential threats before they become problems. 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.
System scanning:
Microsoft Security Essentials offers complete system scanning capabilities with both scheduled and on-demand scanning options to provide an extra level of confidence. Scheduled scans are turned on by default and configured to run weekly at 2 a.m. when the system is likely idle. There are three scanning options:
- Quick scan. On by default, a quick scan rapidly checks the areas malware is most likely to infect, including programs running in memory, system files, and the registry.
- Full scan. A full scan checks all files on the PC, the registry, and all currently running programs.
- Custom scan. A custom scan allows you to scan only the areas you select.
You can choose when you want a scheduled scan to run, view the scan results before cleaning, or run a scan on demand. If the PC isn't turned on when the scan is scheduled to run, Microsoft Security Essentials will start the scan at the first opportunity once the PC is awake and idle.
System cleaning:
When Microsoft Security Essentials determines a possible threat on your PC, alerts notify you of the threat. Threats are categorized as Severe, High, Medium, or Low, and you can choose whether to ignore, quarantine or remove the item from the system.
- Quarantine. Microsoft Security Essentials blocks less severe threats and moves them to a quarantined queue where you can elect to restore or permanently delete them. By placing an item in quarantine, you can test the effect of the item’s removal before deleting it from the system.
- Remove. This action permanently deletes the item from the system.
- Allow. This action stops Microsoft Security Essentials from detecting the item in future scans by adding it to the Allowed Items list. You can remove items from the Allowed Items list at any time.
Having an active firewall is part of securing your PC. During setup, Microsoft Security Essentials scans the PC to determine if a firewall is active on the PC. If no firewall protection is present, you'll be given the option to turn on Windows Firewall.
Dynamic signature service:
Protection needs to be up-to-date to be effective. Dynamic signature is a way to check whether a suspicious program is bad or not. Before a suspicious program runs, Microsoft Security Essentials pretends to run it to determine what it’s going to do. This gives programs special signatures that are checked against our database of good and bad programs. Programs are watched even after they are approved to make sure they don’t do anything potentially harmful like make unexpected network connections, modify core parts of the operating system, or download malicious content.
To find information, definition updates, and analyses of all the latest threats that Microsoft Security Essentials can help protect you against, visit the Microsoft Malware Protection Center.
Rootkit protection:
Rootkits are particularly difficult types of malware to protect against, and Microsoft Security Essentials includes a number of new and improved technologies to address rootkits and other aggressive threats.
- The kernal is at the heart of your PC’s operating system. Microsoft Security Essentials monitors it to see if there are any attacks or harmful modifications.
- Rootkits use stealthy methods to hide themselves and Microsoft Security Essentials has the latest anti-stealth technology to uncover them. For example, direct file system parsing helps find and remove malicious programs and drivers that rootkits try to sneak in.
Protection against real threats, not good software
Microsoft Security Essentials helps block bad software. We keep a list of the most popular websites and downloads on the Internet and use it to test our antimalware definitions and updates before they get to you. This helps us make sure that the protection we offer really keeps your PC safe, and not blocked.
Files in this download
The links in this section correspond to files available for this download. Download the files appropriate for you.
- Download Microsoft Security Essentials 4.0 Final (32-bit)
- Download Microsoft Security Essentials 4.0 Final (64-bit)
Before installing Microsoft Security Essentials, Microsoft recommend that you uninstall other antivirus software already running on your PC. Running more than one antivirus program at the same time can potentially cause conflicts that affect PC performance.
System requirements
Supported operating systems: Windows 7, Windows Vista, Windows XP
Minimum system requirements for Microsoft Security Essentials
- Operating System: Windows XP Service Pack 3 (SP3)*; Windows Vista (Service Pack 1, or Service Pack 2)*; Windows 7*
- For Windows XP, a PC with a CPU clock speed of 500 MHz or higher, and 256 MB RAM or higher.
- For Windows Vista and Windows 7, a PC with a CPU clock speed of 1.0 GHz or higher, and 1 GB RAM or higher.
- VGA display of 800 × 600 or higher.
- 200 MB of available hard disk space.
- An Internet connection is required for installation and to download the latest virus and spyware definitions for Microsoft Security Essentials.
- Internet Browser
Note: *Your PC must run genuine Windows to install Microsoft Security Essentials.
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