Windows =>
What is desktop? icons, arrange icons, changing screensavers, wallpaper, creating folders, shortcuts, task-bar, time settings, system tray, start menu, accessories notepad (typing then saving file, opening file then start word-pad and show changing fonts, color and other options, calculator
what is my computer? about drives. copy paste cut creating shortcut to file/folder/software. rename delete
copying files from DVD to local drives.
guess this will keep you busy for next 1 week.

will update later.