> I want to use Windows 7 with Aero
Here is the problem with Aero in an editing system:
Aero consumes a lot of system resources that could have been used for programs. As a result, there are less system resources available for programs to use. Think of the Windows OS as a six-lane highway. And think of Aero as a closure of one or two of those six lanes. The fewer available traffic lanes result in a traffic jam. And that traffic jam is made worse by a bunch of vehicles that are always slow to begin with. If you have a weaker CPU such as a Core 2 Quad or an AMD CPU, the already sizable performance hit with Windows Aero is made even bigger.
By the way, can you please tell us the exact CPU (processor) that's currently in the system in question, as well as the amount of RAM that it has?
For After Effects, we explicitly recommend that Aero be turned off. I don't think that we make that recommendation for Premiere Pro, but I'm not sure of the details there. (I'll ask Steve.)
The previews look better with Aero enabled but I get less realtime effcts with Aero enabled. It is odd indeed.
Aero changed what handled the memory management for the GPU and is something you want to leave on unless you have a Quadro card and that driver controls the memory management for the video card. Before Aero Memory management for the display was handled by the driver for the video card. One of the benefits the Quadro cards had was they had a driver plugin to isolate memory for applications or frames. The Gaming cards did not have that ability. Aero changed that and took control of that management. The OS now handles the memory management for the GPU/Display which allows the OS to do the frame isolation the Gaming cards did not have before. The downside as there always is one is as RJL states. The Ram shadow is far higher with the Aero on than it is when it's off. So you want to have more than enough system ram to handle that. Aero also improves the interface performance which includes preview once again because the ram management is handled by the OS and the gaming cards did not really have that before.