"...which wrote over Internet Explorer."
It doesn't do that - it's just a separate program, just like any other program.
"....advise how i just go back to IE?"
You just use it - it'll still be there. Look in the program list. If you want to set IE to be the defalt browser (ie the one that starts when you click on web links) :-
Start IE - go to Tools - Internet Options - Programs and click the "Make Default" button