Kingston pen drive not formatting

Hello,

Hello,
i have a 4gb kingston pendrive,from lost two months it's not working, whenever I kept pendrive to system it shows "removable disk" and also it's not formatting and opening, when I open pendrive it asks format the pendrive first while trying to format it's not formatting,
in the properties also it shows
used space:0 bytes
free space :0 bytes
plz give me solution