You're being a bit vague with the info.
Did you change the D2 to usb mass storage before you connected to the computer?
Try updating the drivers on the device.The first time you use a USB connection, your computer may indicate that drivers are being installed.Follow any prompts you see to complete the installation. This may take a few minutes.1 With a memory card inserted, and your phone showing the home screen, connect a Motorola micro USB data cable from your phone’s micro USB port to a USB port on your computer. Your phone should show in the status bar.Note: Make sure to connect the phone to a high power USB port. Typically, these are located directlyon your computer.2 On your phone, flick down the status bar to see the USB connection options.3 Touch an option: .• Windows Media Sync—• USB mass storage—Drag and drop files between you computer and memory cardfolders. When you’re done, use “Safely Remove Hardware” before disconnecting the USB cable.If problems persist try updating the drives.
Click on Start and then Control Panel.
Click on the Performance and Maintenance link.
Note: If you're viewing the Classic View of Control Panel, you won't see this link. Simply double-click on the Administrative Tools icon .
In the Performance and Maintenance window, click on the Administrative Tools Control Panel icon toward the bottom of the window.
In the Administrative Tools window, double-click on the Computer Management icon.
When the Computer Management utility opens, click on Device Manager on the left side of the window, located toward the bottom of the list under the System Tools heading.
Device Manager should now appear on the right side of the Computer Management window.
Find the Motorola Drivers, then update the drivers if necessary by clicking on them.