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Run DXSETUP.EXE from there. It won't hurt anything to run the DirectX installer when it's already installed.
As for it not working in DX11 mode, that doesn't necessarily mean DirectX is messed up. It is likely a problem with your graphics card driver.
What could have gone wrong with graphics card driver? Can it be fixed?
Does the malfunctionig of Direct X interfere with certain mods?
It shouldn't make much difference if you have mods or not.
It would help if you were more specific about what it is doing wrong, and if you posted a DXDIAG.
What's a DXDIAG?
Some mods like the ingame editor won't install.