Windows calls a 32-bit DLL under C:\Windows\System32 when Rhino 5 64-bit runs.
32-bit DLLs should not exist in the System32 folder on 64-bit Windows systems. It may be mistakenly installed by a 32-bit program's installer.
You can save a *.dwi file from Dependency Walker and send it to McNeel Support Team (firstname.lastname@example.org) with a comment “Error 0xc000007b to Kelvin Cheng”.
keywords: 64 bit rhino does not start,V5 startup problems