how can i fix my MP3 Player from a suspected virus?

I have a mp3 player which I use for storing work (word documents), music and pictures. I noticed a message appear on the computer saying 'threat detected'. i ignored it thinking it was minor. the next time i tried accessing the mp3 player from several computers but the compters will not recognize it yet still the display light on the mp3 player still works indicating it is connected. i suspect this is to do with the virus threat. how would i fix this problem?