Minimum System Hardware Requirements For Running Aero Effect In Windows 7
The Aero desktop is a new feature introduced from Windows Vista. This experience features a translucent glass design with subtle window animations and new window colors. They look beautiful. But does it run in your system? Here are the minimum hardware requirements for running “Aero” effects in Windows 7.
1-gigahertz (GHz) 32-bit (x86) or 64-bit (x64) processor
1 gigabyte (GB) of random access memory (RAM)
128-megabyte (MB) graphics card
Aero Feature also requires a DirectX 9 class Graphics Processor that supports a Windows Display Driver Model Driver, Pixel Shader 2.0 in hardware, and 32 bits per pixel.
For best results, you might also want to follow these graphics processor recommendations given by Microsoft:
64 MB of graphics memory to support a single monitor with a resolution that is less than 1,310,720 pixels (for example, a 17–inch flat panel LCD monitor that has a 1280 × 1024 resolution)
128 MB of graphics memory to support a single monitor with a resolution from 1,310,720 to 2,304,000 pixels (for example, a 21.1–inch flat panel LCD monitor that has up to a 1600 × 1200 resolution)
256 MB of graphics memory to support a single monitor with a resolution greater than 2,304,000 pixels (for example, a 30–inch wide-screen flat panel LCD monitor that has up to a 2560 × 1600 resolution)

Note that not all editions of Windows 7 support Aero Desktop Feature. Following are the editions that has Aero Desktop:
Windows 7 Enterprise
Windows 7 Home Premium
Windows 7 Professional
Windows 7 Ultimate
It’s not available for Windows 7 Home Basic and Windows 7 Starter Editions.