So I've searched here and googled and tried everything I've found, and nothing has helped so far. I'm using a PDP Rock Candy Wired Controller, the same controller I've used for years previously, and playing a fresh install of XI on a new PC (Win10). No matter what I do, button inputs do not register in the gamepad config. I've tried with Xinput on and off, I've tried reinstalling my drivers, running as administrator, using preset 5.. you name it. Here's the thing that really stumps me though; when testing controller, despite none of the inputs registering, the vibration test causes the controller to rumble. Any ideas?

Edit I want to thank you all for the suggestions, but after trying so much I've given up. I appreciate the help though, everyone!