Windows 32 and 64 bit exe run problem

Hi developers! I make game in Windows 7 64 bit build under x86 and x86_64 and run under Windows 7 32 bit and Windwos 8 32 bit but it print error can not run bit problem( for x86 and for x86_64 ).After that I build in Windows 7 32 bit for x86 and for x86_64 but the same problem.

With dll no problem I add for 32 bit and for 34 bit dlls ! fter build I can run only in one platform!

What the problem who can help me I want to make exe for 32 bit and 64 bit in one file not 2 files ! I think Unity can do that !
Thanks!

Thanks all developers for help!
I solve this problem in this way. In Windows 7 32 bit I build as x86. After that I test it in Windows 7 32 bit and Windows 7 64 bit all works normal!