System requirements
Recommended system requirements
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1 GHz 32-bit (x86) or 64-bit (x64) processor
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1 GB of system memory
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40 GB hard drive with at least 15 GB of available space
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Support for DirectX 9 graphics with:
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DVD-ROM drive
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Audio output
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Internet access (fees may apply)
Additional requirements to use certain features
Actual requirements and product functionality may vary based on your system configuration. Windows Vista Upgrade Advisor can help you determine which features and edition of Windows Vista will run on your computer.
While all editions of Windows Vista can support multiple core CPUs, only Windows Vista Business, Ultimate, and Enterprise can support dual processors.
Minimum supported system requirements
Certain product features are not available with minimum supported requirements.
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800 MHz processor and 512 MB of system memory
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20 GB hard drive with at least 15 GB of available space
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Support for Super VGA graphics
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CD-ROM drive
http://www.microsoft.com/windows/windows-vista/compare-editions/business.aspx