Well you can certainly move your files/folders off the card and reformat although I'm not sure that's the root cause here. I use FAT32 formatting via the PC personally. Assuming your ringtones are MP3? If so, make sure they are in a folder called Ringtones. If they aren't make said folder and put them in there. Android looks to known folder names for specific items such as Ringtones, Notifications, etc. There's a thread somewhere, guessing the FAQ forum that should spell out how to set up a folder directory and where to place various filetypes so they will be recognized as available options when you are in a menu asking you for a ringtone selection for example.