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I've bben playing FO3 fine until I had to reinstall Win10, and now a system error tells me that ' d3dx9_38.dll ' is missing?

By using the verify/repair option.
Post edited February 27, 2018 by lezineau
Just for reference, the 'd3dx9_38.dll is missing' error a sign that your DirectX is incomplete.

Add this:

They did something funky with dx9 and it;s in 2 parts

Hope this helps anyone who comes by.