Tell us how do you open and play the iso? I don't know if you only extract and play it; that won't work. You have to unecm them.
And about the errors while extracting, its only caused by 2 problems imo. First is that the rar file itself is corrupted. You can probably fix them if the rar file got recovery record.
Plus, errors may also occurred if you're not downloading them correctly or fully.