<A target="_blank" href="http://exo-blog.blogspot.com/2010/03/editorial-microsofts-xp-mode-boondoggle.html">Windows 7 has a virtualization mode but... it requires Hardware Assisted Virtualization (HAV)</A>) support, which Intel disabled on many of its lower-priced chips. Now Microsoft has an update that allows you to run virtualization without HAV.