Getting ready for Windows Vista, available in early 2007, means choosing the edition that's right for you and ensuring that you have the right PC to enjoy the experiences you want.
A Windows Vista Capable PC includes at least:
* A modern processor (at least 800MHz1).
* 512 MB of system memory.
* A graphics processor that is DirectX 9 capable.
A Windows Vista Premium Ready PC includes at least:
* 1 GHz 32-bit (x86) or 64-bit (x64) processor1.
* 1 GB of system memory.
* Support for DirectX 9 graphics with a WDDM driver, 128 MB of graphics memory (minimum)2,
Pixel Shader 2.0 and 32 bits per pixel.
* 40 GB of hard drive capacity with 15 GB free space.
* DVD-ROM Drive3.
* Audio output capability.
* Internet access capability.
http://www.microsoft.com/windowsvista/getready/default.mspx