I had to reformat my Sansa fuze in order to stop getting the message “Not enough Memory delete 90 db”…Now that I reformated…Napster does not recognize the Sansa Fuze as a compatible device it only shows up as G drive and though I subscribe unlimited it wants to charge me for each track I want to download…Help please///

I believe your Fuze must be in MTP mode in order to work with Napster (or any subscription service). To re-format, the player must be in MSC mode. You probably just need to switch it back. SETTINGS > SYSTEM SETTINGS > USB MODE.