Visual studion 2012 windows forms application (C ) .exe is not a valid Win32 application

Visual studion 2012 windows forms application (C ) .exe is not a valid
Win32 application

i have done a application in Visual studion 2012 Windows forms application
using C++. It runs very well in Windows 7 but it did not work in Windows
XP. it says ".exe is not a valid win32 application". how could i do?
Thanks