On Motorola's site, I found this under I connected my device to my computer and nothing happened. How do I get MotoCast USB to launch?
Note: The below instructions are applicable to Windows users only.
If you connected your device to your computer and MotoCast USB is not launching, it is possible that the device drivers are stuck in an error or MotoCast’s MotoHelper Service is not running. To determine which issue is causing this, review the steps below:
1. Start by opening the Device Manager on your computer.On Windows XP:
To open Device Manager, click Start, and then click Control Panel. Click Performance and Maintenance, and then click System. On the Hardware tab, click Device Manager.
On Windows 7 or Vista:
To open Device Manager, click Start, and then click Control Panel. Select System and Security and then DeviceManager.
2. Once you are in the Device Manager, expand the section called Network Adapters. If the Motorola Networking device shows up with a yellow exclamation point, then your device driver is stuck. If not, then this section does not apply and you should proceed to Step 3.In order to clear the error, you have to make sure that you close any applications that hold an exclusive lock on the Mass Storage interface of the device. This can happen if you use your phone as a flash drive, directly accessing content on the device’s storage card via a desktop application. Common applications that can do this, but are not limited to, are: Excel, Word, DOS prompt at the Mass Storage drive of the device’s memory card. Try closing any of those applications and the exclamation point should go away and the error should clear.
3. Another possibility is that MotoCast’s MotoHelper service is not running. To determine if this is the case, run the Windows Services tool.
On Windows XP:
Click Start, and then click Run. Type services.msc in the field. Look at the list of services and find MotoHelper Service. Mark sure the status is “Started.” If not, double-click it, then start the service.
On Windows 7 or Vista:
Click Start, and type services.msc in the search field. Look at the list of services and find MotoHelper Service. Mark sure the status is “Started.” If not, double-click it, then start the service.