You might want to:
– try it again, step-by-step
– install the Sansa Firmware Updater: http://forums.sandisk.com/t5/User-guides-Firmware-Software/The-Latest-Sansa-Firmware-Updater-Version-1-212/td-p/65028
– or contact SanDisk for some walkthrough assistance. In the U.S.: 1-866-SANDISK (726-3475). And other SanDisk contact information: http://www.sandisk.com/sandisk-support/contact-us.