When I tried to run FiveReborn as Administrator, then only black screen showed up and my game crashes instantly
Make a post at: http://forum.fivereborn.com/category/7/support
Follow this: http://forum.fivereborn.com/topic/915/new-error-bug-format
Did you run FiveReborn with Windows 8 compatibility mode?
Moved to Support
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Did you read the F.A.Q?