Monitor driver

Our agency has a Dell Vostro 1500 laptop running Windows XP Pro SP3 that is
having some monitor problems. Ever since I have connected a projector to it
the monitor has intermittantly been using the resolution of 1024x768 and
becoming darkened (very dark but readable) despite the brightness being set
to 100%. The monitor is WXGA and should have a resolution of 1280x800 and
obviously should be much brighter. When I am having the problem, I have
checked the Device Manager and there are three monitors listed and all three
are named "Digital Flat Panel (1024x786)." I uninstall all of these monitors
in Device Manager, reboot the machine, and they all reappear again and the
resolution is still 1024x768 and the screen is darkened. With no rhyme or
reason it will suddenly go back to the correct resolution and brightness
after a reboot. Not every reboot, just whenever it choses. Sometimes the
1024x768 and darkened screen will last for days despite many reboots. Since
it is not my computer, I have not had the opportunity to go into Device
Manager to see what the monitor is named and how many are listed when it is
working properly. In Windows Display Settings, two monitors are listed; 1.
Digital Flat Panel (1024x768) on Mobile Intel(R) 965 Express Chipset Family,
2. (Default Monitor) on Mobile Intel(R) 965 Express Chipset Family. The
(Default Monitor) allows many more resolution options. How do I get rid of
the Digital Flat Panel (1024x768) monitor driver and get it changed to
(Default Monitor) so that I can get this user back to a brighter and easier
to read screen? Thanks for any assistance.