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I'm still running an XP, DirectX 9.0c. Questions:

1.) What is the purpose of DirectX?

2.) Will XP still get later versions of DirectX?

3.) What is the difference between DirectX 9 and 10 (or 11)?

4.) Will higher versions of DirectX make my games run better?

5.) Is it worth buying Windows 7 if my only concern is to run games better?

6.) I must be an idiot for asking these questions, but should I be ashamed of myself?