I have successfully installed a MS download - Virtual PC and Win XP mode onto a Toshiba Win 7 Pro laptop. The CPU supports virtualization. I have installed a legacy software program which seems to function normally on the virual machine. I use Kaspersky protection software on this laptop and have not noticed any conflicts with the firewall. Everything seems AOK. My question: Does the Kaspersky software protect the virtual machine? Or is it necessary to install a second copy of the Kaspersky software on the virtual machine?