How to install Microsoft Security Essential on a Computer Setup:

• First you need to download the Microsoft security essential from the Microsoft’s site, link is here: http://windows.microsoft.com/en-US/windows/security-essentials-download 
• Now double click on the downloaded file and click on “I Accept” and it will validate that you are using the genuine copy of Windows. 
• Then it will install further, after completion of process Update will start automatically and it immediately update itself with the latest antivirus definitions released by Microsoft. 
• MSE regularly scans your computer setup and notify you regarding the problems detected by displaying in the notification area at the right bottom of task bar. 

Working modes: 

• MSE with Green background: This indicates your computer setup is protected against harmful threats. 
• MSE with Red background: This indicates your computer is at risk and some malwares is detected in your computer setup. 
• MSE with Yellow background: This indicates your computer is not protected and you need to scan your computer setup.