Windows 7 Minimum Requirements (x86)
Processor/CPU: 1 GHz processor
Memory: 1 GB RAM
Free Disk Space: 16 GB
Video: DirectX 9 graphics device with WDDM 1.0 or higher drive
Windows 7 Minimum Requirements (x64)
Processor/CPU: 1 GHz processor
Memory: 2 GB RAM
Free Disk Space: 20 GB
Video: DirectX 9 graphics device with WDDM 1.0 or higher drive
Windows 7 Starter
DVD Playback: X Aero: X ICS: X Domain Member: X EFS: X Bitlocker: X x86 RAM: 2 GB x64 RAM: N/A
Windows 7 Home Premium
DVD Playback: √ Aero: √ ICS: √ Domain Member: X EFS: X Bitlocker: X x86 RAM: 4 GB x64 RAM: 16 GB
Windows 7 Professional
DVD Playback: √ Aero: √ ICS: √ Domain Member: √ EFS: √ Bitlocker: X x86 RAM: 4 GB x64 RAM: 192 GB
Windows 7 Enterprise
DVD Playback: √ Aero: √ ICS: √ Domain Member: √ EFS: √ Bitlocker: √ x86 RAM: 4 GB x64 RAM: 192 GB
Windows 7 Ultiimate
DVD Playback: √ Aero: √ ICS: √ Domain Member: √ EFS: √ Bitlocker: √ x86 RAM: 4 GB x64 RAM: 192 GB
WDDM
Windows Display Driver Module - graphic architecture for the video card drivers running Microsoft Windows versions
EFS
Encrypting File System is a feature in version 3.0 of NTFS that provides filesystem level encryption