Hi _craig_c,
Welcome to the HP Community, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I see that you are having some issues with your USB connections. Are any of your other USB devices working? In your Device Manager right click the data traveler and what does it say in Device Status? I have included a link below with some troubleshooting steps to try.
Troubleshooting USB Connections Windows 7
Part of the problem is that there are no specific drivers for your model with Windows 7. HP can not guarantee that everything is going to function properly when you downgrade your operating system.
Thank you,