-EDIT-

I forgot the target="blank" tag in those links, so right-click and open in new tab/window...

"Only a fool walks into the future backwards."

I have done some research, and currently SixtyForce and Mupen64 seem to be your only two options. The SixtyForce website says DK64 is "unplayable". After some lurking, it seems Mupen64 can't get past the intro in DK64. This 'Crossover' program I keep reading about has to be your only option. This video shows you how. Hope it works for you.