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#11
These WinDirStat snips are not very telling. You need to highlight C before you click OK. Then you get a detailed list of what is on C.
PS: I would not mess around with the .dlls. Take the detailed scan and see what the size of your winsxs folder is. Note: The winsxs folder is just a container, but it gives you an idea of how much the system has accumulated over time.