I am trying to transfer music onto my bush mp3 it is saying device has stopped but i have got it plugged in .can you help me please?

Try reflashing the firmware for your device you can find the latest firmware and flashing utilities from the Coby website. Make sure that you back your music up first because when you do this you are setting it back to factory settings.

then follow these instructions to add music;
**Drag and Drop**
Connect your MP3 player to the computer. Some MP3 players connect directly to a USB port, while others connect to a USB port by way of a specific USB connector that comes with the MP3 player. Open the folder on the computer that contains the music files you want to transfer. This is usually the "My Music" folder, available from the "Start" menu, but it can be any folder where you save your music files. Scroll down to the song you want to transfer to the MP3 player. Right-click on the title. When the options are displayed, click on "Send To." Scroll down the "Send To" options and select your MP3 player. This can be listed as your MP3 player's name or as "Removable Drive." Click on this selection. Continue this process until you have transferred all songs that you want to your MP3 player.
--**Windows Media Player**--
If you have a large playlist to transfer, you may prefer to do it from your media player, such as Windows Media Player. Once your MP3 player is connected to the computer, open Windows Media Player. Click on the "Sync Music" tab. Drag songs that you want from your Windows Media Library over to the "Sync Music" column to create a playlist. Click the "Begin Sync" tab at the bottom once you have all of the songs on your playlist. This action will sync all of the songs to your MP3 player with one click. Disconnect your device once songs have been transferred by clicking on the "Safely Remove Hardware" icon in the bottom-right side of the desktop tray.