Module is shown as installed but I can't access its settings
Generic way when you face 


  The website has faced some unexpected error


when enabling module is:


Find in logs what error was it
Fix it's cause
Disable and uninstall module you was enabling
Enable it again


Alternatively, if you have backups, better way would be:


Find in logs what error was it
Fix it's cause
Restore site from backup to it's state from just before error
Try again


If you have specific problem with this way, ask new question, explaining exactly what you need to know, what you did, what was in logs and so on.