I've spent the whole day trying to find solution and there are solutions but they don't seem to work with my PC and device.
I just install Windows 7 and install Windows Mobile Device Center. Then I connect my device running under WM6, but it can not connect. I uncheck the "Enable advanced network functionality" through Setting->Connections-> USB to PC, then restart the the device and still can not connect.
I uninstall WMDC, then restart my PC, and connect to device, still can not make connection.
Does anybody have any suggestion?
thanks

