Multiple Anti-virus Programs
Anytime you install multiple anti-virus programs, you run the risk of one or both programs causing problems to your computer. If you already have an anti-virus program installed, uninstall it before installing Norton. Trying to install both can cause your computer to lock up after Norton has finished installing. The only way to repair the problem is to uninstall both and reinstall Norton. You can have additional protection, such as a firewall, but full anti-virus suites often conflict with each other.
Corrupted Installation
If you run other programs while installing Norton or your computer shuts down unexpectedly during the installation, the Norton installation may be corrupted. While Norton may appear to have been successfully installed, your computer will lock up or freeze when Norton tries to start. If ending all running Norton processes fixes the problem, you likely have a bad installation. Uninstall Norton using the Norton Removal Tool, as the standard uninstaller may be corrupted as well. Restart your computer, close all open programs and re-install Norton.
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