What are the minimum and recommended requirements for Windows Vista?

Minimum Requirements

Any system meeting these requirements is considered Windows Vista Capable and will be able to run Windows Vista. However, you should not expect a machine that just barely meets these requirements to perform as well as Windows XP.

800 MHz or greater processor
512 MB RAM (memory)
20 GB or greater hard disk
At least 15 GB of hard disk space available
CD-ROM drive

Also, A DirectX 9 video card with at least 32 MB of video memory is highly recommended and will greatly enhance your experience with Windows Vista.

Recommended Requirements

Any system meeting these requirements is considered Windows Vista Premium Ready and will be able to take full advantage of the new Operating System, including the new Aero Glass interface.

1 GHz or greater processor
1 GB RAM (memory)
DirectX 9 video card that supports Pixel Shader v2.0 and comes with a special Windows Vista (WDDM) device driver
At least 128 MB of video memory, 256 MB recommended
40 GB or greater hard disk
At least 15 GB of hard disk space available
DVD-ROM drive