Are you asking about computers configuration? If it is, then here it is: 1GHz processor (32- or 64-bit) 1GB of main memory 16GB of available disk space Support for DX9 graphics with 128MB of memory (for the Aero interface) A DVD-R/W drive
Windows 7 was built to run fairly good on even computers that are several years old. It's less of a hog than Vista.
Premium, Professional, Home... blah! Why not just do what apple does and make a really great operating system for everyone. This market diversification just confuses people and fragments the consumer.