If you are using a USB cable to connect your phone to the computer, and if ActiveSync does not recognize the phone or the program stops responding while connecting to ActiveSync, this might be caused by:
Try the following steps in order, one at a time, until one works for you:
Check the phone display for any messages, and respond to them before continuing.
Ensure that the computer and the phone are set up to use USB connections for ActiveSync:
Disconnect and reconnect your phone.
Ensure that your phone is connected to the computer using the USB cable that came with the phone.
Connect the USB cable directly to the computer, bypassing any external USB hubs, docking stations, or other similar external USB ports.
Connect the phone to a different USB port on the computer.
Disconnect, restart, and reconnect the phone.
Disconnect the phone, restart the computer, and reconnect the phone.
Do the following:
Disconnect the phone.
Remove ActiveSync using Add/Remove Programs.
Reinstall ActiveSync.
Restart the computer and then reconnect the phone.