ntdll.dll error when i run a program

I have a program written in Informix Newera that runs well on all MS windows operating systems But when i run it on VISTA it gave the following error

Problem signature:
Problem Event Name: APPCRASH
Application Name: fastcash.exe
Application Version: 0.0.0.0
Application Timestamp: 4174f4ec
Fault Module Name: ntdll.dll
Fault Module Version: 6.0.6001.18000
Fault Module Timestamp: 4791a7a6
Exception Code: c0000005
Exception Offset: 000688e8
OS Version: 6.0.6001.2.1.0.256.1
Locale ID: 1033
Additional Information 1: 0e81
Additional Information 2: 6e0a48a445dd85b69902d38cca6368a9
Additional Information 3: 54f9
Additional Information 4: 94fdecd48785e8ce5e7012f6875b8846


Please help me ....