Hi b52, it´s not realy clear what you are after. If your Laptop Shows a USB drive without that you have a USB stick in it, that is strange. Please let us know a few more Details about that - what Windows Version, are you running it with Administrator rights, have you tried to install dot2 onPC again?
When your home PC Shows internal drive, that´s ok as it is the Default Setting in Setup/patch and fixture schedule/ adding new fixtures. Do a left mouseclick on the field where it Shows "internal" and move the mouse - the different drives of your PC should Show up.