Help me with formatting Kingston flash drive

Hello All,
I just bought a Kingston DataTraveler 8GB. I have just used it to store a backup of my files. When I re-insert it on the computer, the flashdrive display a message of being not formatted, I tried to format it but it can't be formatted. I tried to look what file is on the flashdrive but it appears that there has no capacity display on the drive. Please help me with formatting Kingston flash drive.
