Windows 7 has been the newest generation for Microsoft TM in Operating System.
Try to use Windows 7 Ultimate as a competitor from the previous Operating System Windows Vista.

Minimum Requirements:
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)

Download (copy and paste this link)

http://d01.megashares.com/dl/021f9c0/GRMCULFRER_EN_DVD.iso