A processing system including a host system having a host processor, an associated host memory system, user interface, and a host operating system. The host operating system runs a virtualization program for creating a virtual machine including virtual hardware, a virtual operating system, and a virtual application program running in conjunction with the virtual operating system. The virtual machine instantiates the virtual application program in response to a user request through the user interface to initiate a function. In response to user inputs through the user interface, the virtual machine executes operations with the virtual application in conjunction with the virtual operating system to implement the requested function such that the host system is isolated from an attack initiated during execution of the virtual application program by the virtual machine.