UPDATE: I contacted Canon for service options, and they provided steps to "reset" the camera. After doing this, it is now communicating with my computer. For those who might have a similar problem, here are the steps. - Remove lens and clean contacts...
I tried it on another PC without any success. It could have something to do with the Windows updates. However, I find it very puzzling that my 5D4 and Olympus E-M1ii are both detectable while my 5DS R is not. Two months ago, I could shoot my R tether...