Windows7 comes in six different editions.
Each edition has a different set of features.
Only the Professional, Enterprise, and Ultimate editions can be configured to join a domain.
Only the Enterprise and Ultimate editions include enterprise features such as
BitLocker, AppLocker, DirectAccess, and BranchCache
Windows 7 comes in two different versions. The 32-bit version is also known as the x86 version and
The 64-bit version is also known as the x64 version.
The 32-bit versions support a maximum of 4 GB of RAM.
The x64 versions support between 8 GB and 128 GB, depending on the edition.
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Windows 7 Home Basic and Starter editions require a 1 GHz x86 or x64 CPU, 512 MB of system memory, 20 GB HDD, and a 32-MB graphics adapter that supports DirectX9
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Windows 7 Home Premium, Professional, Enterprise, and Ultimate editions require a 1 GHz x86 or x64 CPU, 1 GB of system memory, 20 GB HDD, and a 128-MB graphics adapter that supports a WDDM driver, Pixel Shader 2.0, 32 bits per pixel, and DirectX9 graphics
