In light of new information from Microsoft, here are the official minimum specifications for all versions of Windows 7.
CPU: 1 GHz+ 32 or 64-Bit processor
RAM: 1 GB for 32-Bit, 2 GB for 64-Bit
GPU: 128 MB DirectX 9, WDDM 1.0 Compatible Video Card
HDD: 15 GB for 32-Bit, 20 GB for 64-Bit
Other:
DVD Drive
DX9 Capable sound card
1024x768 or better capable screen
Keyboard + Mouse
An internet connection for updates and activation.
CPU: 1 GHz+ 32 or 64-Bit processor
RAM: 1 GB for 32-Bit, 2 GB for 64-Bit
GPU: 128 MB DirectX 9, WDDM 1.0 Compatible Video Card
HDD: 15 GB for 32-Bit, 20 GB for 64-Bit
Other:
DVD Drive
DX9 Capable sound card
1024x768 or better capable screen
Keyboard + Mouse
An internet connection for updates and activation.