|Here's what I would do. First of all 800x600 is default resolution.|
The driver for the monitor has nothing to do with it. The monitor doesn't care what resolution it runs on (as long as it is within the specs) The only does what its told to. The driver for a monitor is only a color driver (fine tune color). Its a ICM file that one can just copy and paste. Then pick it in properties.
Your problem is the Video driver. I would go to the device manager and uninstall the driver including the hidden video drivers you can't see in the device manager unless you change the environmental settings.
You will have to uninstall all video drivers and video programs.
Here's how you can change the enviromentals to see the hidden (if any) drivers.
(> = go to) > System Properties >Advanced > Enviroment Variables. Type in without quotes:
Place a one (1) in the line below. You don't need to reboot.
No go to the device manager and in the view Tab, CheckMark "Show hidden devices"
Go to your video click on it and all the drivers will show.
No uninstall all of them UNDER your Video Card driver ONLY.
Reboot into Safe Mode; By default "Safe Mode" will 800x600
(you can change the default too but that's another day)
Now go to yours Dev Mgr and look to see if all drivers are gone ? The only one you should see is the default Window VGA driver.
Now you can install the video driver. You can do that right in safe mode unless your manual says otherwise.
I think that's your only choice to clean out the conflict.