I had a little trouble when I downgraded getting my ripped ISO's working, and after a long round of googling, this is what I came up with:
There is no right way to load every ISO, each tends to have its own procedure to maximise performance.
To help you understand, here is a table I found of all ISO's, their status and the ideal way to load them.
The ISO guide
You will need to download the programs listed at the top and install them as listed. Im not going to tell you how, there are plenty of installation instructions for them.

Having problems? Post them here!