Hello, I found this in my dxdiag file:

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DxDiag Notes
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DirectX Files Tab: No problems found.
Display Tab 1: The file nv4_disp.dll is not digitally signed, which means that it has not been tested by Microsoft's Windows Hardware Quality Labs (WHQL). You may be able to get a WHQL logo'd driver from the hardware manufacturer.
Sound Tab 1: No problems found.
Music Tab: No problems found.
Input Tab: No problems found.
Network Tab: No problems found.

What does that mean? Does it need to be fixed? Hope you can help, thank you.