System Virtualization

This method of prevention is done by virtualizing the working system. By doing so, the actual system prevents itself from being altered by any infection attempt made by viruses.[citation needed] In fact[who?], it prevents from any alteration attempts to the whole system under virtualization[citation needed]. Such as the virtualization is, without any antivirus software the virtual system can still be infected and consequent damages or malicious actions the virus is meant to cause will still occur. But as soon as the system is shut down and restarted, all the changes and damages previously done to the virtual system will be reset.[citation needed] This way, the system is protected as well as the virus is removed. However, any damages to unprotected (or unvirtualized) data (usually another data drive/volume or data on the network connected to the system) will remain. So will the malicious effects it has caused such as data theft or the like.
Sourece : http://en.wikipedia.org/wiki/Antivirus_software#Security_Concept

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