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When the theme personalization window opens, you will be presented with a list of all of the themes currently saved on your computer. The currently loaded theme will be highlighted, and the four components that make up the theme ("Desktop Background", "Window Color", "Sounds", and "Screen Saver") will be previewed below the themes list. To begin creating a custom Windows 7 theme, simply click on one of these four items in order to change its current settings. A new unsaved theme will be created automatically.
Desktop Background allows you to choose one or more images that will be displayed as the background for your theme; multiple images will be displayed in a slide show format that you can set the time interval for (from 10 seconds to a full day). Window Color allows you to adjust the color, intensity, and transparency of both the Taskbar and open windows using either the provided adjustment sliders or the color mixer to find just the color that you want. Sounds allows you to choose an existing sound scheme or to create a new one based on your preferences. Screen Saver lets you choose the screen saver that Windows 7 will use and customize its settings.