Need some simple help. I have tried the configuration tool to set my screen resolution to 800x600 but the screen goes black with motion from the mouse but never comes back. I have to use Task Manager to end the task. Am I just out of luck with running in higer resolution?

Here is my PC details:

Dell 5100
32mb Mobility Radeon 7500 Video Card
512MB Memory
Windows XP Pro

Thank you,
Spicoli