If you have the Windows Vista operating system on your computer, you must install Windows Mobile Device Center (WMDC) in order to synchronize data on the computer with your device.
The Windows Vista operating system includes the basic WMDC application partially installed, including device drivers and AutoPlay functionality. The full installation includes a device-specific user interface and synchronization functionality.
To fully install WMDC on your computer:
Download WMDC from the Windows Mobile Web site at http://www.microsoft.com/windowsmobile/en-us/downloads/microsoft/device-center-download.mspx.
Notes
If you plug your device into your computer before you install WMDC, your computer may initiate an automatic download of WMDC through Windows Update.