Yes. You need more than 256 MB to run Vista, anyway.
According to Microsoft, the minimum amount of memory recommended for a computer running a version of Vista with the Aero interface (Home Premium or above) is 1 GB.
In the experience of many users, though, performance is poorer that you would expect until you get to 2 GB of RAM.
The Related Link will take you to the Microsoft page with system requirements for Vista Home Premium.
The default user interface for Windows Vista and Windows 7 is called Windows Aero.
windows vista
Windows Vista Home Premium
Aero
when using the Vista Aero interface.
Aero
3D interface
Vista Home Premuim
The functions of Windows Aero are not all that different when used in Windows Vista. Some of the most practical uses of Aero when in Vista include the glass effect visual look, the ability to switch between programs, and fine tuning the color scheme.
To use windows aero in vista operating system 512 mb of ram is required
On the programming level, everythins is new starting from the core and finishing with drivers and interface. Also, vista Aero Glass requires pixel shaders 2.0. Practically it's not better than windows xp.
No. Aero is only included in Windows Vista and newer.