I would suggest you start out with remodding your system with Softmod Any Wii. When you get to chapter 2, install everything that says is optional as if it is required, including menu 4.1 (and ending with priiloader).
That should overwrite just about everything on the system with a new set of IOSs and cIOSs to get you back to where you were.
link to Softmod Any Wii guide is in my signature.
And to rebuy OoT is only $10. If you like the game, should be worth the cost.