Hi, I'm Jewel with Kingston Technical Suport and would like to offer our assistance. Our USB drives do not have a write protection setting built into them, but it is possible for it to be set through an operating system. If that is the case here is a walk thru on how to remove it using Command Prompt:
http://techchannel.radioshack.com/remove-write-protection-usb-drive-1673.html
If that does not work then there is something wrong with the drive that is preventing the computer from writing to it. We stand by our products and in that case can replace the drive under it's five year warranty. For further assistance, please call us at 1-800-435-0640 (USA and Canada only) M - F 6am - 6pm PT and I or another available Technician will assist you.
Thank you for selecting Kingston as your upgrade partner.