I have used Norton for many, many years and found it to be very reliable - I don't use the 360 but Norton 2011 presently, soon to be updated to 2012 - it is much less bloated than in previous years. I know of many people who successfully use Norton 360 with no problems.

Norton usually manages the inbuilt security so you don't have to do anything. From my experiences I favour keeping Norton.

With all the advice about making sure that your PC is adequately protected most people feel that they have to use additional security. I quite agree with what is said about Microsoft Security Essentials, but there is always the doubt.

I suppose it is a matter of choice - I do know that a friend of mine had Norton 360 installed and found it to be unsatisfactory - Norton 2011 however has been fine. All the time I have used Norton - for many, many, years, it has never blocked legitimate programmes and processes - luckily for me.

Yes you will. Never run 2 realtime antivirus products together. They will conflict with each other and cause problems. I have Microsoft security essentials running in the background all the time, and also have MalwareBytes antimalware and Superantispyware that I can run a scan once a week manually. Nothing has ever been found in over a year now with all three scanners.