LawB10

To the OP if you have the 64 bit version of the software, and you have Windows 7,8 or 10 upgrade to 64 bit, it will be on the installation disk. It will take about 1 to 2 hours depending on you're machine.

All of Chief Architect software comes in 2 flavors, 32 bit and 64 bit, the user decides which version they want. 32 bit will run on a 64 bit machine, 64 bit will not run on 32 bit machine. The operating system itself is 32 bit unless the user changes it to 64 bit. As for legacy software, you have to tell windows to run that software in compatibility mode.