O.K., I got it to work yesterday. The only thing I did different was to stop the Gigabeat by using the "safely remove hardware" option in Windows.
However, I could not get my database to initialize no matter how many times I tried. The backlight wouldn't stay on long enough, and the screen kept fading out. I couldn't get any of the themes to work, possibly a problem with the fonts.
I did use the latest available files. I will keep trying! But, in the meantime, I'm back to Toshiba's firmware.
Thank you everybody for your suggestions, etc. - I'm sure I'll be back.