I need the software for my mp3 (by 5 users)

When the player is plugged into your computer via an USB port, it appears on your Windows Explorer as another drive. The drag-and-drop works here as it would for any drive or folder. Highlight the materials you want to delete and do so. Open another window with your tunes directory displayed, and right-drag as many files as will fit onto your player. You're welcome.

You can usually "format" the mp3 player via My Computer. They are mostly flash based memory.

Otherwise, you can generally get the cd contents from the manufacturers website.