my computer says i need drivers for my sansa m230, help please!

I was given a sansa m230 mp3 player and it didnt have the disk anymore. when i plug it into the computer, i get an error message saying that it cannot be read.  when i diagnose the problem, it says that there are no drivers installed. does anyone know where i can get the install disk as a download or get the driver install files for xp. i have tried the files on the driver locator and am not having any luck.

Please help!!