ntdll.dll error appcrash while running old programs in Windows Vista/7 x64-bit

The ntdll.dll error comes under many programs and their cause is different in each case. Especially while running a very old program/software/game with new versions of x64-bit type Windows may pop-up this error.





Here the Developer Studio in Compaq visual fortran v6.x calls this file(ntdll.dll) directly from Windows for Native application interface. This file has been heavily patched in