Well, two days later, and I finally found success! I never could get the flasher to work or the download wizard, so I had to go through the proverbial back door. I didn't initially realize one could manually update with the wizard, but as soon as I discovered this, I transferred the image from my mac to my husband's Toshiba, ran the update wizard and Voila! And wow, I'm glad I didn't give up. Thanks to all for your advice!