The heart of this newest Vista version is Windows Aero, an entirely reworked user interface with semi-transparent windows that employ a "milk glass" effect.

Windows Aero uses semi-transparent windows to let users see part of what's behind them on the desktop.

The Windows Vista basic user interface originates from Windows XP, technically speaking. Visual styles are activated, but there's no transparency, nor are 3D effects turned on.

The familiar look and feel of Windows 2000 is identified as the "Windows Standard" setting.

The "Windows Classic" settings match the same colors and desktop themes used in Windows 98.

Sluggish performance: when an error-prone driver is used, or too many applications run in parallel, Windows can turn this interface off either temporarily or permanently.