Sansa Express - MTP Media Player

My computer didn´t know Sansa Express as disk drive.

It knows it as MTP Media Player. and gives me two choises, what to do, when I connect the device with computer: 1) transfer files with media player or 2) take no action.

Windows dont show express under my computer, and transfer failed.

I want that windows understand the device as disk drive. Or at least shows it under my computer -> other.

What shall I do?