Here are the System Requirements of Windows Vista.Windows Vista Home Basic
• 800-megahertz (MHz) 32-bit (x86) processor or 800-MHz 64-bit (x64) processor
• 512 megabytes (MB) of system memory
• 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
• 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
By a Windows Aero-capable graphics card, Microsoft refers to a product with a Windows Display Driver Model (WDDM) driver, with a DirectX 9-class graphics processor unit (GPU) that supports Pixel Shader 2.0. Additionally, the graphics card also has to support 32 bits per pixel and to pass the Windows Aero acceptance test in the Windows Driver Kit (WDK).
