"1.1.1. Zune Development Is Not Supported on 64-Bit Operating Systems
The XNA Game Studio 3.0 (Preview) does not support development of games for Zune if XNA Game Studio 3.0 (Preview) is installed on a 64-bit operating system such as Windows XP Pro x64 Edition or the x64 versions of Windows Vista®." ~ http://creators.xna.com/XNA3CTP/readme_xna.htm
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"1.1.1. Zune Development Is Not Supported on 64-Bit Operating Systems
The XNA Game Studio 3.0 (Preview) does not support development of games for Zune if XNA Game Studio 3.0 (Preview) is installed on a 64-bit operating system such as Windows XP Pro x64 Edition or the x64 versions of Windows Vista®." ~ http://creators.xna.com/XNA3CTP/readme_xna.htm
Unfortunate... I can't install it.