Plug in the mouse before you start the PC, it should find and install using the built in Windows drivers. You may want to load the Intelliemouse drivers later if you find some of the features are missing.
All the printers I have come across will need the drivers loaded before connecting. Personally I would go to the manufactures website and download the latest drivers for your printer. Much less chance of problems and essential using a different operating system, for example if you had Win.97 before.