Restore original appearance and theme

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http://www.ubuntux.org – Hi, Can someone please help me restore my appearance and theme to its original settings. I made it look like a mac but now I don't want to. So I tried changing it to the original look but the buttons feature (close, minimize, maximize) still look like a mac. It looks like this: http://i29.photobucket.com/albums/c253/remeday86/Screenshot2.jpg I'm new to ubuntu btw. So if you know how to, can you please explain it step by step. Thanks in advance! (Distributions)