IE updating questions

Ok I am going to update from IE 8 to IE 9
As I have IE9 as a hidden Microsoft update
I have a few questions though if anyone can help answer them
1. If I update to IE9 will it automatically remove IE8?
2. Will the norton add ons like intrusion prevention, automatically transfer to IE9?
3. Will flash active x and adobe reader automatically load into IE 9 if I have them for IE8?