I would not call that a correct answer.
Deleting things from your Photoshop installation area is not a good idea. It may break your ability to get updates in the future.
And Pictus 171, no, it's still only 3 keys needed: Press and hold Control - Shift - Alt simultaneously (or Command - Shift - Option if on a Mac) immediately upon cold-starting Photoshop. If you get the keys down quickly enough - and you have to be really quick - it will prompt you to confirm deletion of your current preferences, which will lead to the establishment of a fresh default set. If it does not prompt you, you haven't been quick enough to get the keys down.
-Noel