Thank you, I didn't even think to look at that. It appears as though Mamewah wants to run in 640x480 @60Hz and 16-bit. I'll try playing with the settings.
3/4/2008 12:56:13 PM MAMEWAH v1.62 launched
3/4/2008 12:56:13 PM Cursor scheme: Windows default, Arrow: (None), Wait: (None), AppStarting: (None)
3/4/2008 12:56:13 PM Desktop colour: 0
3/4/2008 12:56:13 PM Wallpaper filename: C:\Documents and Settings\Main\My Documents\Arcade Background.bmp
3/4/2008 12:56:13 PM Desktop display mode: 800x600 @ 85Hz, 32bit colour
3/4/2008 12:56:13 PM Decimal symbol: '.'
3/4/2008 12:56:13 PM Games list read: mame-0.lst
3/4/2008 12:56:14 PM Mode 640 x 480 @ 60Hz, 16bit colour not available
3/4/2008 12:56:16 PM Mode 800 x 600 @ 85Hz, 32bit colour selected after 1 attempt(s) at 1/2 second intervals.
3/4/2008 12:56:16 PM MAMEWAH quit