This fix changed my Sony Walkman to a USB devce. This solved the problem with WMP (I could now sync and transfer diles via drag and drop).
However, now tracks that I have donloaded with my Napster to Go subscription do not work as (I think) the device is showing up as a USB device rather than an MTP device. I tried performing the opposte of the steps above but Vista keeps on opening it up as a USB device.
In the properties for the portable device, the drivers are listed as:
The driver software is shown as:
Microsoft WPD FileSystem Volume Driver.
If anyone could offer any help that would be much appreciated!
I did the same thing and have finally found how to change it back:
In device manager look under 'Universal Seral Bus controllers', you should have one listed with the name of your walkman. Right click it and uninstall. Re-plug in your walkman and it should be back to normal.
I had mtp issues as well and followed the same advice to switch to usb mode, I wanted to switch back and see if I could get mtp mode working but now my device is recognized as a disk drive no matter what I do.