The system Requirements of Windows Vista?

The system Requirements of Windows Vista is atleast A modern processor (at least 800MHz 512 MB of system memory. A graphics processor that is DirectX 9 capable

1gig of RAM is the required memory for running a WinVista

This is the system requirement for vista you can read it on here too http://www.microsoft.com/windows/products/windowsvista/editions/systemrequirements.mspx 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) 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)

P4 with at least 1.3 GHZ ( I guess) but I am sure about RAM, 512 is required and 1 GB is recommended, also I think the window is just available on DVD so u need to have DVD ROM to install it