Next launch the Zune Desktop software and you should get the following screen. The update will take a few minutes, and after it’s complete you should be good to go and can start using your Zune.
To update your player in the future, go to General Settings then Player Update.
The Zune software is configured to automatically search the Internet for updates to Zune firmware.
A message will appear on your screen when it finds an update that needs to be installed, and you should click "Install" to install it.
while versions since 2.0 are built independently with additional Direct Show decoders for AAC, MPEG-4 and H.264.