The browser options was an update Microsoft put through a week or so back, something to do with having to offer others as part of competition regulations.
I don't have windows set to update without prompting first so was able to decline and hide the update. Always like to see what's going to be installed first.
Norton... no idea !
Was Norton preinstalled as a trial on your PC... it often is on laptops etc.
Perhaps see if it shows in "control panel" under installed programs and if so download the official removal tool from Symantec (Norton)