Microsoft has upgraded Microsoft Security Essentials (MSE) to version 2.1.1116.
MSE is absolutely free and can be used in Windows XP, Vista and 7. Both 32 and 64-bit versions are supported.
Features of MSE are :
Comprehensive protection : Microsoft Security Essentials helps defend your computer against spyware, viruses, worms, Trojans, and other malicious software.
Quiet Protection : Microsoft Security Essentials doesn’t get in your way. It runs quietly in the background and schedules a scan when your computer is most likely idle. You only see alerts when you need to take action.
Easy to get, easy to use : Microsoft Security Essentials is available at no cost, there’s no registration process that requires billing or personal information collection. 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.