Windows 7 has good voice recognition built in. Why not ugprade Win 7 to gain access to virtualization, or use a third-party product that will run on your current product? Finally, "not supported" isn't the same as "doesn't work". Assuming the driver problem is Dell not providing drivers for the ALS888 audio chipset, then that stuff's from 2006 and Realtek will probably have the drivers, if XP SP2 or higher doesn't support it out of the box.
As usual, people are going through hoops here because someone won't spend money in the right place at the right time (i.e. the software, not the hardware).