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don’t have much use for the Sidebar, disable it. Windows Aero, while handy in scanning through various windows and showing displays of programs in the taskbar, also consumes quite a bit of memory. If you care more about function over fashion, disable those two options.
Also, be aware that some programs you install will attach themselves to your taskbar and will automatically start along with Windows. By right clicking on those icons, you can access menus, which will allow you to disable their presence in the tray. This is particularly useful for programs you do not use very often.
Another process that can really consume resources is hard drive indexing. Indexing allows you to search for files, folders and programs within your computer quickly. If you do not have capable enough system resources, or don’t really see the need of having your hard drive being indexed, you can certainly disable it.

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