problen connecting crystal report in windows 7 64bit

Hi i have an application written in vs 2005 and xp os. My customer has windows 7 64 bit. Application works fine except when i load a crystal report. Then i get the screen to ask me username and password , like not to have created an ODBC. But indeed , i have created an system DSN ODBC . I have done My application to be compiled and run in compatibility mode x86 . Probably the problem is that dont load the correct ODBC . I have read that exist in windows directory two subdirectories \system32 for 64bit (!) and \syswow64 for 32bit(!). But i dont know how to load the correct odbc. Maybe to go to [login to view URL] file and to change the path from there ?