Well if that message comes up then your card does not support the Direct3D settings. First off there was a paper that came with your dell that tells you what kind of card came with the comp. If you dont have that then right click on your desktop then go to properties then settings(last tab i think) and it should say somehwere on there Dell on then your video card name. Copy that down and then go to google.com or something and search drivers for that card. If its a NVIDIA then jsut go to the website(
http://www.nvidia.com/content/drivers/drivers.asp) and download the drivers that match up with your card, install, reboot, and try again. If this does not work then you will need to get a new card to run the game.
Theres a post on this page that has a list of cheap ones.
Also try
www.tigerdirect.com) they have some good prices with some rebates.
Hope this helped.