Mix of 32 and 64 bit Informix modules

I purchased a Series EM64T from a software vendor who is aso an IBM dealer. Unbeknown to me, they put the 32 bit O/S on it. It turns out the application software is 32 bit and they had probs.... whtever. As I believed I had a 64 bit O/S I installed some Informix software. It was when testing this that I discovered I only had a 32 bit O/S. What are my sensible options? If I keep it as it and replace my 64 bit Informix software will I be I the position of not utilising the hardware? Are there any other probs I may have with a 32 bit O/S running n a 64 bit machine? Currently I have Informix SE (32 bit) Informix SQL (64 bit) and Informix ESQL (32 bit). It was ISQL that failed of course. If I send the machine back to have the O/S reinstalled (64 bit) what are the problems I could run in to? Any help would be appreciated. Kate