usb pen drive driver

My brother has a pen drive that is Kingston datatraveler DTI/2GB .
Suddenly don't know how but it won't work.
when I insert it to the pc,in my computer we can see removeble disk (G:).When double click on it, it gives the message:

G: is not accessible.
Incorrect function.

I checked it more than five pc,but give the same error.

If any one can solve my problem then it very helpful for my brither.