accidentally deleted system file..

Hi, I have a 2GB Sansa Express mp3 player for more than 5 monts now.

This morning I accidentally deleted the system file inside my mp3 player which I thought is useless, and I turned off the computer once I finish using. After that, when I wanted to use my Mp3 player, it says ‘Boots error, shutting down’… only then I realized is the system file that I deleted this morning causes it to happen.

So i thought i can look for the system file from my recycle bin, however, it is not there anymore, and the computer is not recognizing my mp3 player.

What can I do to restore it?

Thank you.