Windows Vista

Windows Vista is essentially warmed-over Windows XP. If you're currently happy with Windows XP SP2, we see no compelling reason to upgrade. On the other hand, if you need a new computer right now, Windows Vista is stable enough for everyday use
Windows Vista system requirementsIf you want to run Windows Vista on your PC, here's what it takes:

•1 gigahertz (GHz) 32-bit (x86) or 64-bit (x64) processor
•1 gigabyte (GB) of system memory (512 megabytes (MB) for Home Basic)
•40 GB hard drive with at least 15 GB of available space (20 GB for Home Basic)
•Support for DirectX 9 graphics with WDDM and 128 MB of graphics memory (32 MB for Home Basic)
•DVD-ROM drive
•Audio Output
•Internet access (fees may apply)

Additional requirements:
Actual requirements and product functionality may vary based on your system configuration.
While all editions of Windows Vista can support multiple core CPUs, only Windows Vista Business, Ultimate, and Enterprise can support dual processors.

Minimum requirements:
•800 megahertz (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

Product functionality and graphics may vary based on your system configuration. Some features may require advanced or additional hardware.