Star Wars Knights of the Old Republic II: The Sith Lords

What is the purpose of having Administrative Rights on a Windows 2000 or XP system in reference to Star Wars Knights of the Old Republic II: The Sith Lords?

Without Administrative Rights, you may be unable to select certain application options because they are grayed out.

 For example: You will be unable to install the Microsoft DirectX software unless you are logged onto the system with Administrative Rights.

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