VirtualBox is a powerful x86 virtual machine software, it is not only a rich feature, but also excellent performance. More gratifying, VirtualBox Open source, is a release under the GPL licensed free software. VirtualBox can be run on Linux and Windows hosts, and it supports installing Windows (NT 4.0, 2000, XP, Server 2003, Vista, Windows7), Dos/windows 3.x, Linux ( 2.4 and 2.6), OpenBSD and other series of customer operating systems.
If you are still a novice using a virtual machine, then it doesn't matter, I teach you how to install and use it.
First download a virtual machine from here (select VirtualBox for Windows hosts download).
After downloading, follow my following picture to install it! It's very simple.