I have already spoken before antivirus Microsoft (MSE), is actually the one I use now. It's fast and reliable.
The disadvantage of using Microsoft Security Essentials is yes or do have to have activated Windows Update to update the virus definitions, which, to many, we do not like. But there is a way to upgrade without having to MSE why I mentioned, and through MSE Update Utility.
You can download the tool from Addictive Tips, which also explains how to use it and throw some tips to automate the task.
The disadvantage of using Microsoft Security Essentials is yes or do have to have activated Windows Update to update the virus definitions, which, to many, we do not like. But there is a way to upgrade without having to MSE why I mentioned, and through MSE Update Utility.
You can download the tool from Addictive Tips, which also explains how to use it and throw some tips to automate the task.