Try these steps to resolve the issue:
Please try a different USB port
Click here and download this upgrade to your desktop. Once completed, double click the upgrade icon on your desktop
Go to the control panel in Windows and click on “Add/Remove Programs”. Check for anything called musicmatch, musicmatch Jukebox or Yahoo Jukebox. If you have any, please uninstall them.
Unplug your magicJack, wait 15 seconds, and plug it back in
Go to My Computer and locate the magicJack drive, right click that drive then click format and click start. Unplug magicJack, wait 15 seconds, and plug magicJack back in. You will need to download the magicJack upgrade again.