Today i am going to give you a RAW copy and paste for Windows Vista Minimum Requirements
Windows Vista Starter, and Windows Vista Home Basic
800-megahertz (MHz) 32-bit (x86) processor or 800-MHz 64-bit (x64) processor
512 megabytes (MB) of system memory
Note On system configurations that use system memory as graphics memory, at least 448 MB of system memory must be available to the operating system after some memory is allocated for graphics.
DirectX 9-class graphics card
32 MB of graphics memory
20-gigabyte (GB) hard disk that has 15 GB of free hard disk space
Internal or external DVD drive
Internet access capability
Audio output capability
Windows Vista Home Premium, Windows Vista Business, Windows Vista Enterprise, and Windows Vista Ultimate
1-gigahertz (GHz) 32-bit (x86) processor or 1-GHz 64-bit (x64) processor
1 GB of system memory
Windows Aero-capable graphics card
Note This includes a DirectX 9-class graphics card that supports the following:
A WDDM driver
Pixel Shader 2.0 in hardware
32 bits per pixel
128 MB of graphics memory (minimum)
40-GB hard disk that has 15 GB of free hard disk space (the 15GB of free space provides room for temporary file storage during the install or upgrade.)
Internal or external DVD drive
Internet access capability
Audio output capability
Note A Windows Aero-capable graphics card is a graphics card that meets the following requirements:
Supports a Windows Display Driver Model (WDDM) driver
Has a DirectX 9-class graphics processor unit (GPU) that supports Pixel Shader 2.0
Supports 32 bits per pixel
Passes the Windows Aero acceptance test in the Windows Driver Kit (WDK)