Norton.com/Setup | How to fix Norton Error Code 8504, 104
If the error does not get resolved after you restart your computer, you need to uninstall and then reinstall Norton antivirus product on your device. To uninstall Norton antivirus software, you first need to download and reinstall the same or different version with these easy steps. Also, please note that the steps might slightly vary depending on the browser and its version you are using.
Step 1: f you are an existing user of Norton family, you are recommended to uninstall the program first for the sake of fix the problem.
Step 2: Open your web browser, find and download Norton.com/Setup Remove and Reinstall tool
(After your find the correct page, the tool extension will be installed automatically or if not, click on the download button shown on the window when prompted. Find the downloaded file by pressing ctrl+J key altogether to open download history and run the fine)
Step 3: Open the folder location where the extension has been downloaded.
Step 4: Click and open the file with NRnR icon
Step 5: The step will direct you to License and Agreement page, read and mark agree to proceed ahead
Step 6: Choose Advanced option
Step 7: Select Remove only option
Step 8: When directed to next, click on Remove bottom
Step 9: Restart your PC after performing all the above steps manually