Dell Inspiron 1525 Laptop screen problem.

PLEASE HELP SOMEBODY!!!

I have a Dell Inspiron 1525 and have redently been experiencing SERIOUS video/screen problems.

It started when I was playing Tomb raider 1 through DOSbox and I changed it to fullscreen. This seemed to work untill the entire screeen went GIANT and all the colours messed up. When I go on to try and change the screen resolution,it comes up with a message saying that my VGA driver is to old for the operating system (windows vista 32-bit) and then can't change the resolution and it says my current screen resolution is -1 by -1 pixels. The only way I have found so far to fix this is to have it plugged into a monitor but as soon as I take the connection out the screen goes mad again.

One more thing. As Tomb rider 1 is a dos game, when you try and play it but NOT through dosbox, it comes up with an error saying does not support fullscreen. but through dosbox it was ok as it was playing the game THROUGH that therefore not actually playing the game fullscreen, but dosbox itself.

I really hope someone can help. I have tried re-installing my video driver and it flicker back to normal for a couple of seconds, but then just goes straight back to the old, and very big, way.

Please help...thanks.