Mp3 walkman NWZ-B153F doesn't function

Hello,



Good morning,I borrowed my sister's mp3 walkman (NWZ-B153F) to saved my files because my flashdrive was borrowed by my classmate. I saved it by using our computer. one day while going to school, I used it by listening a music, when I arrived in the printing press, I turn off the mp3 because I will use it to print my files for my assignment. when the mp3 put in the computer it was not detected so we decided to remove i.t then, sadly the mp3 was not anymore working. I press the power it's still the same. :(

I THINK IT WAS A VIRUS?WHAT I NEED TO DO?

Please help me. please..please..
thank you