How to determine which software to deploy for 32 bit and 64 bit Windows OS ?

How to determine which software to deploy for 32 bit and 64 bit Windows OS ?

I need to deploy the Lync 2010 software to all workstations.  How can I setup to deploy the 64 bit version to only 64 bit machines and the 32 bit version to only 32 bit machines ?
 
We are currently running Desktop Central 80038.
 
Is their a pre-script that I can run to know whether to install 64 bit or 32 bit ?
What is the best way to handle that ?
 
Thank you!
 

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