Virtual Box^

by Oracle allows you to build a virtual computer, in your computer. It can be installed on Windows, the Macintosh OS or Solaris. You can then install operatings systems into the "fake" machine, such as Linux (Ubuntu), Windows (NT 4.0, 2000, XP, Server 2003, Vista, Windows 7, Windows 8), DOS/Windows 3.x, Linux (2.4, 2.6 and 3.x), Solaris and OpenSolaris, OS/2, and OpenBSD.

Virtual Box images (at least Ubuntu) does NOT like to run with Windows Virtual Machine at the same time. When you start WVM, and it crashes the Ubuntu machine instantly, and it will not restart until WVM.