When my Droid X is connected to my Win 7 computer via USB cable, it is not detected as a Droid device.
When set in PC Mode; Device manager has a yellow exclamation point for MTP USB Device, under "Portable Devices" showing the error "This device cannot start. (Code 10)"
When set in Windows Media Sync; Device Manager has the yellow exclamation point for MTP USB Device, under "USB Root Hub/Motorola USB Composite Device" with the same error code.
When set in "USB Mass Storage"; Device Manager assigns a drive letter to the phone under "Portable Devices" and it will be seen labeled as MOT in Windows Explorer, and I can see the contents of the SD card.
When set as "Charge Only"; there are no errors shown in Device manager and the phone is given a drive letter under "Portable Devices" The contents of the phone or SD Card, are not accessible through Windows Explorer.
I am using the latest Motorola USB drivers. I have uninstalled and reinstalled them. I have removed all the USB Devices in Windows Device Manager and rebooted to let them re-install. None of these made a difference.
It may seem a small point but I would like to have the phone seen without error, especially in "PC Mode". I have seen many references to the MTP USB Device driver not loading, being a problem for Samsung Phones, but haven't seen much for the Motorola Droid series.