Go to: START>SETTINGS>CONNECTIONS (TAB). You'll typically see an application called: USB TO PC. Upon opening this application, you'll see an option called: Enable Advanced Network Functionality. Make sure that this option is NOT SELECTED (checked).
NuevaSync allows direct, over-the-air, native synchronization of certain smart phones and PDA devices with public PIM, and calendaring services including Google Calendar. NuevaSync does not need any software installed on your device because it uses synchronization protocols that are already built in