Change WindowsXP appearance to Windows7

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I bored with the look of my desktop or laptop and want something different view to my computer, you can use rainmeter and rocketdock change my Windows XP is as beautiful and good view. As a normal girl who wrote, being the altar became a beautiful girl. I tried to change the appearance of the Windows7 Windows XP on my computer, the same result, even is dirty. Is there a more practical way to change the appearance of the same....?