VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is a professional-quality virtualization solution that is also Open Source Software.
VirtualBox runs on Windows, Linux, Macintosh and OpenSolaris hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista), DOS/Windows 3.x, Linux (2.4 and 2.6), and OpenBSD.
The below video by EdgyRootStudios [1] demonstrates how to run Microsoft Windows XP on Linux Ubuntu Edgy Eft 6.1.0 using VirtualBox.
VirtualBox [2]
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Carlie Fairchild [3] is the publisher of Linux Journal.
Links:
[1] http://youtube.com/user/EdgyRootStudios
[2] http://www.virtualbox.org
[3] MAILTO:publisher@linuxjournal.com