Today , I have been struggling with the problem
my Sansa clip was not working on my windows xp pro edition.
I searched on internet and I found two solutions
first , to upgrade windows media player to wmp11 and I hated it.
I would not do update until I see a great feature that I have expected to come.
I dislike too much fancy and GUI.
second was something that related to USB mode msc.
But it was n't clear anywhere , how to do this
Very simple .this is in your sansa clip .explore menus.up and down.
go to settings .select USB mode as MSC and connect again...
Here is what you wanted.