First of, let me ask you . . . and please don’t be offended, but when you say you only have FM on your Fuze’s screen, you do know that to see other options (Music, Videos, Photos, Recordings, FM, Settings, etc.) you just need to turn the scroll wheel, right? Alternatively, you can use the right & left buttons (3 & 9 o’clock on the wheel) to scroll between Main menu options. Others here have made the same error by not knowing how the player worked.
If this isn’t it (only FM in the window), then to format the player, push the sliding power switch on the side down to the furthest position to put it on HOLD. You’ll see orange under the button. Now press & hold the REW |<< and plug the Fuze’s cable into the bottom of the unit. The USB end should already be plugged into your computer. This procedure ‘forces’ MSC connection mode on the player. Continue holding the REW button (left side of the scroll wheel) until It comes up in Windows Explorer as 2 drives, each with their own drive letter. The 1st one will be the player; the 2nd drive letter will be the SC card slot. This occurs whether there’s a card inserted or not. You should be now able to right-click on the player’s drive and select Format… (don’t use the Quick Format option).
After the formatting is done, see if you can see more than the FM on the display now. If not, and you want to re-load the firmware, follow the manual instructions in the Fuze Firmware post. One, or both of these procedures should fix your problem.
Let us know how it goes. 
