How to Reset Photoshop preferences (In Windows)

First, hold down all three Ctrl+Alt+Shift buttons
Now “while keeping those button held,” simply open Photoshop or a file that opens with Photoshop
As Photoshop loads, you should get a prompt asking if you would like to “delete the Photoshop settings file”, Click yes
You should now have a fresh slate with all of the settings returned to their default.