orangebanana wrote: If you mean mounting the iso in the CD/DVD-settings instead of the superdrive, I can tell you this doesn't work either as I have tried this, too.
In your OP you mentioned "iso-files from games" so how did you create the ISO Images and are you aware that most commercial optical media containing games also employs technology intended to thwart its illicit duplication!? Image may be NSFW.
Clik here to view.
Sometimes there will even be a further error message popping up which seems to be sent by Fusion but I have never finished reading it because it disappears quickly. I will try making a screenshot of the message. Maybe it would help if you know what Fusion is trying to say?
Directly after such an event... To help figure out what is what, the best way to provide comprehensive diagnostic information is to use the "Collect Support Information" command from the VMware Fusion (menu bar)> Help > Collect Support Information and then attach the .tgz file it created on your Desktop to a reply post.