The Microsoft Security Essentials Definition Updates deploys a package containing the latest virus signatures for the latest release of Microsoft Security Essentials.
Keeping Microsoft Security Essentials up-to-date ensures that your computer is protected at all times and that the latest viruses and spyware variations will be detected during scanning.
Of course, you could just leave Microsoft Security Essentials to update its definitions on its own and, obviously, it is advisable you do so.
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.
MSE is simple to install, easy to use, and is automatically updated to protect your PC with the latest technology.
It runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want without interruptions or long computer wait times.
Comprehensive protection—Microsoft Security Essentials helps defend your computer against spyware, viruses, worms, Trojans, and other malicious software.
I recently installed malwarebytes, and found a few trojans and a good bit of adware. I quarantined the viruses, but just now my computer has been acting absurdly laggy, taking about 10 seconds to allow me to type anything into Firefox.It installs after a quick download and Genuine Windows validation and then stays automatically up-to-date with the latest protection technology and signature updates.Quiet Protection—Microsoft Security Essentials doesn't get in your way.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Security Essentials can only be installed on Windows Vista and Windows 7, as on more recent Windows iterations it is superseded by Windows Defender.Therefore, you should point to the Windows Defender Definition Updates if you are running Windows 8 or higher.