(Possible solution in my reply to your other post)
The USB Mode option is found, on the device, via Settings > System Settings > USB Mode. The device has three options, MSC, MTP, or Auto Detect. MSC mode is where the Sansa is recognized as a basic flash memory device. MTP mode is where the Sansa is recognized as a portable media player; this is done via Windows Media Player 10 or later, on your PC. Auto Detect will try MTP first, if supported on your PC, then it should revert to MSC.
You can see which mode is active by opening a Windows Explorer window on the computer, with the Sansa connected. If it shows up with a drive letter assigned, like E: for example, it is in MSC. If listed as simply Sansa Clip Zip (in caps and smalls), you’re in MTP.
Note that the PC performs a _separate installation_for the device in each USB mode. It’s possible that one of these modes has an issue. By manually selecting a mode on the device, instead of the Auto mode, you can be sure of the connection mode.
In MSC mode, right clicking on the device and selecting properties will give you several tabs with options (MTP will not, all you’ll have is “properties”). Navigating to the Hardware tab, highlight the device, Properties button, then you can uninstall. Though it sounds counterintuitive, start by uninstalling, unplug, then let Windows reinstall next time the device is plugged back in. This is the same as going to the Device Manager.
In MTP, use the Device Manager, look for the Sansa under Portable Device, same procedure.
Hope it makes sense, as Windows has so many menus, with “all roads leading to Rome.”
Bob 
