Windows Vista recommended system requirements

Home Premium / Business / Ultimate
- 1 GHz 32-bit (x86) or 64-bit (x64) processor
- 1 GB of system memory
- 40 GB hard drive with at least 15 GB of available space
- Support for DirectX 9 graphics with:
- WDDM Driver
- 128 MB of graphics memory (minimum)
-Pixel Shader 2.0 in hardware
-32 bits per pixel
- DVD-ROM drive
- Audio Output
- Internet access (fees may apply)

Additional Requirements:
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.
Home Premium / Ultimate
TV tuner card required for TV functionality (compatible remote control optional).
Home Premium / Business / Ultimate
Windows Tablet and Touch Technology requires a Tablet PC or a touch screen.
Ultimate
Windows BitLocker Drive Encryption requires a USB Flash Drive and a system with a TPM 1.2 chip.

Home Basic:

- 1 GHz 32-bit (x86) or 64-bit (x64) processor
- 512 MB of system memory
- 20 GB hard drive with at least 15 GB of available space
- Support for DirectX 9 graphics and 32 MB of graphics memory
- DVD-ROM drive
- Audio Output
- Internet access (fees may apply)

Additional Requirements
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.

Windows Vista minimum supported system requirements
Home Basic / Home Premium / Business / Ultimate

- 800 MHz processor and 512 MB of system memory
- 20 GB hard drive with at least 15 GB of available space
- Support for Super VGA graphics
- CD-ROM drive