VS2008 32 and 64 bit issues

I have searched the internet and got nowhere fast 😔

I am writing software in Visual Studio 2005 wirh integrated Crystal Reports, this deploys and works on most windows operating systems.

My new customer is using windows server 2008 and the software would not install - after much looking I found that I needed to upgrade my visual studio to 2008.

I am using a 32 bit computer to write and complile my software - this pc is now using Visual Studio 2008 with integrated crystal reports - when I compile and install on a 64bit windows server 2008 pc - it will not run.

I have tried the following:-

Setting compile mode to 64bit.

installing the CR Redist 2008 before and after installing the software.

Not sure where to go from here, any help will be gratefully recieved

Thanks in advance