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However, you can test drive and use Windows Media Player12 on your Vista computer (not XP). Misaki2009 @ devianart has ported Windows Media Player 12 of Windows7 for Windows Vista. After you download, you need to copy one file and one folder and its all done.
Copy wmploc.dll in C:\Windows\System32
Copy Windows Media Player folder to C:\Program Files
Just copy above file / folder and you are all set to use Windows Media Player12 on Vista. Please note: this is not an official release, make sure you create a restore point before trying this out - use discretion.