Norton security 2015 wont update

when updating, check for updates highlighted and processing, but just says updating.
this is on a fresh build of windows and has been working ok past few days.
norton came up with an error it could not fix.so i used the uninstaller and reloaded.
i did the first update and it asked me to reboot.
then it let me do a second update that took ages
but now im back with the same fault on the third update. it takes even longer and
it says it could not connect to the server and to check my internet connection.
i have come off wifi and am wired into my broadband hub. heeeeelp please