CGI Issues on Apache in a 64-bit Operating System

Question

I have a Ruby on Rails application that uses Apache as web server and my application calls a CGI for some time. This was installed in Windows Server 2008 R2 64-bit. My problem is, the CGI is not working as expected, Apache says 'premature end of script'. I am sure that there is no problem with my CGI nor in my Ruby application because it is properly working on my Windows Server 2003 32-bit until I migrated it to Windows Server 2008 R2 64-bit.

Is this a known issue for 64-bit machine/OS? Or I just need some extra configuration somewhere in my Apache to make this work?

Thanks! :)