1. A method for emulating in a host computer system a guest computer system, the guest computer system including a guest operating system, comprising the steps of: establishing in the host computer system a hypervisor for hosting a guest operating system; establishing in the hypervisor a page table; monitoring the page table of the guest operating system; and reallocating the page table of the hypervisor if a change to the page table of the guest operating system causes a conflict between the page table of the hypervisor and the page table of the guest operating system.