Install Bridge if it is not already, that has a camera import command that accepts most camera models (with exceptions) Both Mac and Windows can import files using the file browser (explorer and finder), You can either connect via USB or a memory card reader (reader is recommended for fastest transfer)
For any more help I have to agree with Noel, you need to provide the OS and its version you are using as details can be specific to that computer and not all of us use both systems.