<p>Curing AIDS is probably more a biology thing to do, to be honest. Biomedical Engineering generally involves devices of some kind. You'd major in bio, go get a PhD in biology -- possibly with an MD as well -- and then go do research in a virology department. Or you could go into industry rather than academia, but I don't think you'd get to choose your own products.</p>
<p>Biomedical engineering is when you want to build things like ultrasound devices or cardiac catheters or stuff like that.</p>