Take a read here Installation Error
I don't use MSE but I would suggest you uninstall and reinstall MSE using one of the programs suggested in this link.
I don't use Norton either, I use AVG Full Internet Security - when installing this it disables the Windows firewall. I would think this would be the same with Norton. Then if you were to uninstall your 3rd party security things should revert automatically to Windows firewall. In my opinion you shouldn't have to turn it on.
If you disable your Norton firewall and it doesn't revert to Windows firewall then take a look here Windows Firewall on/Off
But try the uninstall/reinstall of MSE first and that hopefully should cure the "updates" problem.