Windows Vista

Vista Capable

Processor - 800Mhz,
HDD - 20GB,
HDD Free Space 15GB,
Memory - 512MB,
GPU - DirectX9 capable,
GPU Memory - 32MB,
Other Devices - CD-ROM.

Vista Premium Ready

Processor - 1Ghz,
HDD - 40GB,
HDD Free Space - 15GB,
Memory 1GB,
GPU - DirectX 9 capable GPU with Hardware Pixel Shader v2.0 and WDDM Driver support,
GPU Memory - 128MB,
Other Devices - DVD-ROM

Hope this is helpful

Sam
 
Minimum supported system requirements

PCs that meet the minimum supported system requirements will be able to run the core features of Windows Vista with the basic user experience.
Windows Vista Minimum Supported System Requirements
Processor 800 MHz 32-bit (x86) or 64-bit (x64) processor1
System Memory 512 MB
GPU SVGA (800x600)
Graphics Memory -
HDD 20 GB
HDD Free Space 15 GB
Optical Drive CD-ROM drive2
Audio -
Internet -

1) Processor speed is specified as the nominal operational processor frequency for the device. Some processors have power management which allows the processor to run at a lower rate to save power.
2) The CD-ROM may be external (not integral, not built into the system).

[taken from http://www.microsoft.com/windowsvista/getready/systemrequirements.mspx]
 
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