Every time I launch BaK the screen goes green. Audio is good, I can hear the intro music. I'm running Windows 7 and Dosbox 0.74 Every time I return to windows the task bar messages me and says 'the color scheme has been changed to windows 7 basic.'

Anyone know what I need to do?

Right-click on BaK desktop shortcut, under Compatibility settings check 'disable visual themes' and 'disable desktop composition'

You may also try to switch to another graphics mode, there should be an .exe for that in game folder.