Unable to open Lightroom 4

I have a 2GHZ intel core duo IMac running snow leopard 10.6.8.  I have downloaded the beta Lightroom 4 successfully.  When I go to start the application I get
the following:
You cannot open the application Adobe Photoshop Lightroom 4.app because it is not supported on this type of mac. 
I run Lightroom 3 without difficulty.  Any suggestions?
Anna

The Mac system requirements:
Multicore Intel® processor with 64-bit support
Mac OS X v10.6.8 (Snow Leopard) or v10.7 (Lion)
2GB of RAM
1GB of available hard-disk space
1,024×768 display
DVD-ROM drive
Internet connection required for Internet-based services
I don't think your CPU is compatible...

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