I have built a game with construct 2 in 64 bit system and made its exe for running game. But that exe (win32) is not working properly in 32 bit system.
You need to provide far more detail.
What versions of C2 and NW.js are you using?
What OS are you having problems with?
What export options are you using?
Does it work if you just export one of the built-in examples?