You might be able to,
I have been running server 2008 in vpc 2007 without issues.
I have been unable to use server 2008 directly on the os, bluetooth and quickset do not work.
You will have to contact dell, its $25 dollars to buy the software. If you have it for Vista, they might send it to you for xp for free if you still have a warranty. Its not free software so its not kosher to download it.