This is the original CD that came with the Palm Zire 21 unit, this is not a copy.  This can be used for either Windows or Mac installation.

• P/N: 400-5788A-US
• A/N: 742-5788A-US

For information on how to install the Palm Desktop on Windows 7/Vista 64 Bit OS, see the link below;

Windows 7 64 Bit USB Drivers