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SGH51 Reboot your system and try reinstalling. Cheers!!
SGH51, if Soul's post doesn't fix your issue try using the Remove option on the Norton Remove and Reinstall Tool, and after rebooting, download a preactivated copy of your Norton product from your account.
After the reinstall, run Live Updates until no more are found rebooting where required and then reboot once more.
You can always try using another browser,as well.