What Fuze software? And I don’t know of anything related to the Fuze that would require (or ask) you to “create an account”. 
If you are referring to the Sansa Updater which is glitchly and resource-hogging nag-ware that is supposed to update firmware on Sansa mp3 players, all I can advise (and just about everyone else here thinks the same) is don’t use it.
If you want to update the firmware on an Sansa device, simply go to the Firmware Thread here on the forum, find your product and download and install the firmware manually. It takes less time than messing with the Updater and is dead simple. 
