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Before Install Windows Vista It is necessary to know about system requirement for windows vista. I am listing here Windows Vista system requirement.

System requirement for 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

System requirement for 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:
o A WDDM driver
o Pixel Shader 2.0 in hardware
o 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)