When I try to run Charlie Foxtrot, a message from my computer tells me "video mode not supported", What should I do? ???
Run "winsetup.exe" and try with or without the 85Hz option. This option is only useful for certain old displays. I have only one item selected: Resolution = 640x480. You can try to run in a window instead of full screen.
If you still don't succeed: Right click on the desktop and change the settings of the display (right click, settings/properties tab, most probably colour depth).