Returnil Virtual System (RVS) is a powerful virtualization technology for windows that doesn’t let anything affect the windows installation drive. The new version uses a combination of antivirus and virtualization technologies , so your system is safe from both malicious software and unwanted changes.

The program creates a theoretical layer over the main (C) drive, if enable the RVS, any changes on ‘C’ drive will be automatically saved only in this layer and will be automatically erased up on the next reboot.

So RVS can easily prevent malware and spyware programs. This is a great tool for those who want to try different software on their PC.
As a holiday gift Softpedia giving away 1 year free licence (limited time, ends on Dec 31, 2009) of Returnil Vertual system 2010 Home Lux to its readers. Interested users can now get it free from Softpedia.