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There are multiple definition update releases per day, thus making it time-consuming to manually download and deploy each definition update through the Configuration Manager Console.
The Definition Update Automation Tool can be used to automate the steps required to keep a deployment of Forefront Endpoint Protection update definitions up to date.
One important thing is to download the correct definitions for your system’s architecture: 32-bit or 64-bit.
Once you grab the setup file you need, just double click on it and follow the on-screen instructions to apply the latest definitions to Microsoft Security Essentials.
This is the same as when Windows automatically downloads the update, and can be useful if you aren't always connected to the Internet or haven't turned your PC on for a few days.
If you want a more recent update (usually uploaded to this page within the last three hours), you can manually download and install it.
Usually, updating once a day gives you a good level of protection, and it prevents us from constantly updating your software and interfering with how you use your PC. This can be helpful if you have hard-to-remove malware, Windows update isn't working properly, or you aren't always connected to the Internet.
But in case your computer is not permanently connected to the Internet or if you haven’t turned it on for a longer period of time, you should consider either forcing an update or manually updating the latest updates.
It is the latter case when you need to download and install the Microsoft Security Essentials Definition Updates.
The installer contains the complete, up-to-date anti-malware definitions for Microsoft Security Essentials, deploying the scanning engine (mpengine.dll), along with other files, such as mpasbase.vdm, mpasdlta.vdm, mpavbase.vdm, mpavdlt.vdm,
Please note that Microsoft Security Essentials can only be installed on Windows Vista and Windows 7, as on more recent Windows iterations it is superseded by Windows Defender.