i own a earlier version of a sansa mp3 player heres what I do to put songs on the computer because when i try to sync with windows media player it puts songs on there that i dont want.
In your settings on your mp3 go to USB and set it to MSC. ( that sets it as a removable drive)
When thats done if you havent done this before it will probably say on your taskbar that it installed the hardware properly. When thats done go to My Computer and look for that name (sansa e260) it will have a drive letter next to it. If its there than great! Now find a song, highlight it , right click and go to Send to the drive letter of what the e260 is (ex. f:/ , g:/ e:/)
Thats how i put songs on there without the hassle of Windows media player. If you have any questions or confused feel free to ask!
Thanks for all the help.