Well I figured it out, but there is nothing I can do at this time. The
display driver needs to be updated. I have an Intel 965 display driver and
my computer already has the newest version, so until Intel comes out with a
new one......
After searching the internet I found a round about way of avoiding it, I
tested it and it worked.
Turn the power options off that put it in sleep mode when you close the lid.
From then on put it in sleep mode from the start menu, make sure it's in
sleep before you close the lid. Once it's sleep, close the lid. I did this
several times and when I reopened and made it "wake up" my resolution hadn't
changed.
I don't believe this is a Dell issue, but more of a Vista bug.
Hope this helps.