Have you downloaded the driver from the Dell site?
http://support.dell.com/support/down...24381&vercnt=1
It is the first link, M3W2K04.EXE
If after a restart, it still does not work, try the patch they provide at
http://support.dell.com/support/down... fileid=21179
ALSO. Before you try to install a new video driver, make sure you delete any others you have attempted, unless it is the Microsoft supplied VGA driver. Good luck.