Thanks cluctch and Marty1884.
MS does not sell it but you have the option to change it to 32-bits if you have the media and re-use the license for 64-bits. Limitation is imposed by LOB - old p-of-c DOS based program that does not run in 64-bits.
The PC is a brand new OptiPlex 5050 equipped with on-board dual-monitor but the Intel driver does not exist for 32-bits.
Connections are not important as I have all kind of cables ..... 32 bit OS is not an impediment, it is a requirement.