What happens when you plug the MJ into the usb port of your PC? Have you tried different ports?
I have 3 magic jacks all running on xp pro and have had no problems with XP installing them....been using MJ for over 2 yrs now. I'm on the 5 yr plan for $60....works great!
Your product says:
Product: Microsoft Windows 7 professional - upgrade from home premium
Which are you running? Windows 7 or XP pro?
Some HELP in posting on Computing.net plus free progs and instructions Cheers