Callig a 32 bit app in from asp dot net code in 64 bit windows 2008 R2 not executing,

Hi 

My web applicaiton calls a 32 bit app an exe file from my asp dot net code and its works fine on win XP 32 bit  machine ,,,but when i deploy it on Win server 2008 R2 with iis7 ,, on 64 bit machine its not able to call that exe file/programm.

I have installed that exe program on that win server 2008 r2 machine ,,,,,i ve configured iis 7 to 32 bit enabled but nothing is working,,