The procedure entry point CreateDXGIFactory2 could not be located in the dynamic link library C:WINDOWSSYSTEM32d3d11.dll.
I did some digging, because Rift doesn’t use DirectX 11 anyway, it is safe to just remove two of the injected files that SweetFX injects in the rift directory:
Delete: dxgi.dll (or rename to dxgi.dll.bak)
Delete: dxgi.fx (or rename to dxgi.fx.bak)