Sansa Fuze 8GB can't upload new music

I am unable to upload new music from windows media player to my fuze. I have always been successful at syncing music this way. I’m sure there is no problem with the new music because they play fine on my computer and there was no problems when I did a virus check on them. The music currently on the fuze works fine, but I have noticed that it takes a bit longer for the player to turn on and for the music to star playing.

Does any know how to solve this problem? Thank you

Have you tried running ChkDsk?

I know sometimes WMP doesn’t work for me.  I don’t know why, but sometimes it just doesn’t work.  So I go to Media Monkey (free) to put music, etc., on my Fuze. 

Also, How much memory do you have left on your fuze?