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Built with powerful and unmatchable threat protection features, Norton deserves to be a boon for its users. However, we should not give over the fact that it has some hassles in terms of errors. Error 8504 is among those errors that occur when the Norton product is going through certain security or installation issues. To rectify this problem, you can either go through the steps mentioned on our official website or call directly to our technical team at norton helpline number, which is serviceable 24×7 online.