Can run .exe but cannot use .exe file with 64 bit operating system

I built an application in labview (32 bit) in xp. The exe file generated from the labview 2009 is able to function well in windows vista (32 bit). For this i installed run time engine and since my application requires vision tools so i also installed the vision run time engine 2009. The application reads values of a device (from microcontroller) from the virtual com port (through USB).
Now the problem is the .exe cannot response in Windows 7 (64 bit). For this i installed Run Time engine 2009 (for 32 bit) and also vision run time engine. The exe runs but does not read any value from the COM port and does not response any thing.
This is somehow related to 64 bit operating system. 
Further to mention, the control input for 'VISA resource name' input of 'Visa Configure Serial Port' block generally detects the COM Port where the device is connected (e.g. COM1, COM2 etc)  and used to display the choices (on drop down menu) but with 64 bit operating system this is not happening.
What could be the possible problem? I would be happy to know if someone has come across this problem or if someone can help me to solve this problem.
Simply i would like to run an .exe application build in 32 bit to run in an operating system of 64 bit. This application has VISA and Vision motion tools.

NI VISA is a software abstraction layer for different physical interfaces (e.g. RS232).
I understood that your application is working with this in order to select and communicate with COM interfaces.
MAX (Measurement & Automation Explorer) is the tool to configure and test NI drivers, in this case VISA.
So if no COM shows up in MAX, you have a malfunction (or missing) installation of VISA.
Norbert 
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

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