Model Information Here:
http://solutions.us.fujitsu.com/www/content/products/notebooks/brochures/DS_u820.pdf
Installed with Windows Vista. Purchased in November 2009. Booted a couple times to try it out. Lent it to my niece over the summer of 2010 (no idea how much she used it). Shipping it as is, so you will probably want to do a reinstall. Not sure what she may have put on it, or if she ever even used it.
$350. If you don’t like, send me a PM as soon as you get it and send it back to me for a full refund minus shipping.