Windows Vista Business Sp2 (32 Bit) 〈Best〉
A DirectX 9-capable processor with a WDDM driver and at least 128 MB of memory to support the Aero Glass interface.
At least 1 GB of RAM (though 2 GB was recommended for better multitasking). Windows Vista Business SP2 (32 Bit)
Enhanced Wi-Fi performance and added native support for recording data to Blu-ray media. A DirectX 9-capable processor with a WDDM driver
To run Vista Business SP2 effectively on a 32-bit (x86) architecture, your system ideally met these "Premium Ready" standards: 1 GHz 32-bit (x86) or 64-bit (x64) processor. Windows Vista Business SP2 (32 Bit)
Integrated Windows Search 4.0 for faster indexing and reduced the power consumption for systems when running in a idle state.