It's a Windows game and I'm pretty sure the installer is a Windows executable as well. So, don't use DOSBox.
_setup.exe seems like an odd name for an installer (does it really have the underscore _ ?). Maybe there's another file that is the actual installer?
Can IZArc really convert an nrg image to iso? I doubt it. That's why you can't even mount the iso-image in DOSBox, the iso-image is corrupted.
Quote:
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imgmount e c:>game\asghan.iso -t iso
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I'm surprised that works (the > instead of a \ ). You should do it like this:
imgmount d c:\game\asghan.iso -t cdrom
But as I said because this is a Windows game using DOSBox does not help.