how i convert my x86 project in x64

[Le rner]

please can anybody explain me how i convert my x86 project in x64 when i change it in configuration manager and set to x64 it gives error like Error 1 error C2371: 'ULONG' : redefinition; different basic types C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\intsafe.h 65 1 Rec_Pen_drive plz help for this

[Lost User]

It may be that you are including a 32 bit header somewhere that is confusing things.

[Le rner]

ok thank you to guide me in right direction

[bingbing457]

on toolbar, change debug and release setting to win64