If you are looking for security software to protect your PC that runs quietly and efficiently in the background (AND IS FREE), then look no further than Microsoft Security Essentials.
If you are a current user of Microsoft Security Essentials, be advised that Version 2.0 has been released. You can upgrade by either waiting for the upgrade to come to you (via the automatic updates) or you can download and manually install the upgraded version from [ HERE ] . If you go the manual route, the installation will automatically detect if you are upgrading or performing a full install.
The good about Microsoft Security Essentials is that it is a Microsoft based product that provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software. I have been using Microsoft Security Essentials since its’ inception and I can personally attest that it is doing an excellent job in protecting my PCs. It is very easy to use (and understand) and performs in a manner where it will not bog (slow) down your PC.
If you have a desire to give Microsoft Security Essentials a try, I highly recommend you remove the antivirus software you currently have installed on your PC. To assist with the complete removal of any exisiting security software on your PC, I recommend using AppRemover to assist with the uninstall and removal process.