So, I've just found MAME4All here: http://dl.openhandhelds.org/cgi-bin/wiz.cgi?0,0,0,0,73,22 (bought my wiz at thinkgeek.com so they referred me there for emus) and it's pretty much the only emulator that I'm having trouble using.
I have it set up in my Game folder just fine and the emu will...