You sir, are a life saver.
I also feel real stupid cause I totally read all of that earlier today when trying to fix this.
Better late than never.
Quote from Mario9dragon
I think you can just copy your saves and maybe your screenshots (important folders in there) then back out and delete the .minecraft folder and re-download Minecraft itself from the site. I've done that several times when I eff up a texture pack or want to take out a mod. But back up your worlds and whatnot