Causes of Error Code 8504,104
More than one anti-virus program is already installed on your computer
Incomplete download and then after installing Norton 360
The virus can damage Norton 360 antivirus or Windows file software
You can delete any Norton 360 files from your computer

This is by far the most important method of troubleshooting and will most likely remove all Norton errors from the first attempt.

If you are using Norton Family, we recommend uninstalling it before running Norton Remove and Reinstall from the Control Panel.
Download the Norton Remove and Reinstall tool.
Save the file to your desktop and click the NRnR icon.

Run Norton Remove & Reinstall Tool

In some browsers, the document will be automatically saved to the default location, which is Downloads or Records.
Accept the terms and practice all instructions to complete the installation.
Click Advanced Options.
Select Only eliminate and click Delete
Click Restart when prompted.

2) Remove Non-Symantec Security or Unknown Softwares

You can simplify the elimination of non-Symantec goods or malware that in most cases cause application conflicts by downloading our favorite Iobit uninstaller.

Not only will you be able to remove the software from your computer, but also delete the registry entries created by these applications during installation or during use.

If you are great at troubleshooting computer problems on a personal computer and checking if any applications installed on your computer are good or bad, by verifying the publisher’s ability, remove them manually;

• Go to Control Panel and open Programs and Features

Or Press the Windows + R keys to launch the Run dialog box. and enter Appwiz.CPL

• Select a non-Symantec security product from the list of currently installed programs and then click Uninstall or Remove.

• Also, remove the software from unknown publishers.

1. Update the graphics and other system drivers.

All system drivers must be up-to-date (primarily the Pictures driver) to be able to easily start any applications installed on the Windows operating system. We recommend downloading our carefully selected free driver update tools to minimize your work, or you can manually update your drivers by following the instructions below;

• Press the Windows + R keys to open the Run dialog box.

Type the following text, and then press Enter. devmgmt.msc

• In the Device Manager window, double-click Graphics Cards.

• Right-click the HD graphics card and select Properties.

• On the Driver tab, check if the graphics card driver is out of date or present.

When the driver is outdated, you need to download the latest update and install the latest version of the graphics card driver.

• You can use the Free Driver Updater Tool or choose the graphics card manufacturer and download the driver to install manually:

Intel HD video images

NVIDIA images

• Check for other drivers who may need an update.

• Restart your computer and run Norton to assess if the problem has been resolved.
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