Windows 7 adds support for systems using multiple various graphics cards from different companies, a new version of WindowsMedia Center, a device for Windows Media Center, improved media features like the XPS Essentials Pack and Windows Power Shell are included and a newly designed Calculator with multilingual functionalists including scientific mode.
Minimum Hardware Requirements for Windows 7:
Processor : 1 Giga Hertz(1GHz)
Memory (RAM) : 1 Giga Byte(1GB)
Hard Disk Drive free space : 16 GB of available disk space
Optical drive : DVD drive (only to install from DVD/CD Media)
Windows 7 Home Premium in 9 MB Free Download