This document introduces virtualization and discusses its uses and different types. It focuses on virtualization in Windows 7. Hardware-assisted virtualization allows multiple operating systems to run concurrently on one physical machine using Hyper-V or Windows Virtual PC. Windows 7 supports hardware virtualization for Intel VT or AMD-V CPUs. It also details how to create a bootable VHD file to install an operating system in a virtual machine without using actual installation media.