There are different Editions for Windows Vista:

Windows Vista Home Basic

Windows Vista Home Premium

Windows Vista Business

Windows Vista Enterprise

Windows Vista Ultimate

Home Basic and Home Premium are consumer-focused versions, with features like Family Safety (formerly known as Parental Controls), and Home Premium includes Media Center.

Business and Enterprise are corporate-focused editions, with features like Domain join and Remote Desktop/Terminal Services.

The Ultimate edition combines all features of both the consumer and corporate editions into one version.



All editions come in both 32-bit (x86) and 64-bit (x64) editions, and users are free to use the same product identifier for both platforms.

Source: DirectX FAQ

Desire to develop a Game in Windows?

XNA is the choice!

You can develop games with DirectX with the Managed language C# easily.

Check : http://msdn2.microsoft.com/en-us/xna/default.aspx

You can freely download the XNA Game Studio Express from here