Adobe Photoshop Lightroom v4.0 (32 & 64 Bit) Multi

Windows
 Processor: Intel® Pentium 4 or AMD Athlon® 64
 OS: Microsoft® Windows® 7 with Service Pack 1, Windows Vista® Home Premium, Business, Ultimate, or Enterprise (certified for 32-bit and 64-bit editions) with Service Pack 2
 RAM: 2 GB
 Hard Disk: 1 GB of available hard-disk space
 Media: DVD-ROM drive
 Display: 1024 x 768 Monitor Resolution
 Internet connection required for Internet-based services

64-bit Installation Notes
Mac: Lightroom 4 is only available as a 64-bit application for Mac.
Windows: The Lightroom installer contains both a 32-bit and 64-bit version of the application. By default, the 64-bit version will be installed only on Windows Vista and Windows 7 64-bit operating systems.

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URL : http://www.adobe.com/products/photoshop-lightroom.html