Well when you have your iso you'll want to "mount" it on a virtual drive. To create a virtual drive you'll need a program like Alcohol 120% or Dameon Tools (I believe both programs automatically set up virtual drives on installation). Once the virtual drive pops up on your computer right click it and choose "mount disc", browse for your iso and you should be ready to go. Of course depending on the iso and the emulator you might have some more issues. PM me if you need anymore help.