If you are looking for a free anti-virus, anti-spyware, and anti-malware solution then Microsoft Security Essentials is a good candidate. It provides real-time protection against viruses, spyware and malicious programs while it's easy to install and manage. One of the major advantages of running Microsoft Security Essentials is that it integrates smoothly with the underlying operating system given that your machine runs genuine Windows. So, be clean before you try it! Make sure you uninstall any other anti-virus programs you may have running on your machine before installing it as two anti-virus programs may conflict and leave your machine unprotected apart from the intermittent problems they may cause.
Microsoft Security Essentials shares a number of core components that we find in other Microsoft security products such as, MS Forefront products which are backed by the Microsoft Malware Protection Center (MMPC) and the continuous research in the technology. When it comes to anti-virus software you have to rely on products that respond quickly to the latest threats. Behind MS security products there is a mechanism that provides an effective response to a wide range of threats with security research laboratories in multiple locations around the globe on the lookout for new malicious and potentially unwanted software threats wherever and whenever they arise.
Microsoft Security Essentials has a small footprint, scans and updates are scheduled to run when the PC is idle and use a low-priority thread. CPU throttling ensures that no more than 50 percent of the CPU is utilized by Microsoft Security Essentials activity. Microsoft Security Essentials uses smart caching and active memory swapping so signatures that are not in use are not taking up space, thus limiting the amount of memory used even as the volume of known malware continues to increase.
Microsoft Security Essentials is also available for small businesses with up to 10 PCs and for larger setups Microsoft recommends Microsoft Forefront Endpoint Protection.
To download a free copy of Microsoft Security Essentials and get more information go here.