what does the upgrades do? and my video4fuze has an error

MP3 players Sansa Fuze
1

Same as title

2

Upgrade from what? The latest you need is x.x.26.

You should ask about your specific video4fuze error in the video4fuze thread. But you’d do better to be more specific. 

http://forums.sandisk.com/sansa/board/message?board.id=sansafuse&thread.id=31437