What does "Restored copy from - Kitty had a snack" mean?
Also, does this mean my computer is clean?
I can't tell you I'm afraid. Combofix's author wants to keep this under wraps. What Combofix does with the file and how it replaces it/disinfects it/whatever is a secret to stop the bad guys working round it. Combofix's nickname is Kitty so "Kitty had a snack" means Combofix "ate" the rootkit.