Do you have WMDC 6.0 or 6.1?
Have you been to this Windows Mobile forum? Take a look at the first "sticky".
http://forums.microsoft.com/WindowsM...1762&SiteID=65
They usually prescribe a lot of uninstalling/reinstalling WMDC and deleting/remaking partnerships. What exactly have you tried? Hard to offer any suggestions without knowing.
Mine worked without a hitch.