Microsoft has at last released their Zune Media Player software for Windows Vista. Since its release the player has not had and Vista compatible software available.
The download is available on Microsoft's Zune website which says this about the software:
"Zune software is your one stop for music and entertainment. Manage and view your songs, videos, and pictures. Rip and burn CDs. Create playlists. Edit track and album information. And Zune software can automatically import your existing files, including your music and video from iTunes and Windows Media Player."