Scenario:
After uninstalling Norton AntiVirus 2002 (assuming you installed it by itself, and not as part of Norton SystemWorks) you then try to install another version of NAV, and it fails with the error: "Setup has detected that one or more Norton AntiVirus 2002 drivers are marked for removal/deletion at next reboot." and rebooting doesn't help.
Solution:
You can remove NAV 2002 manually using the rnav2003.exe - just run it and select the correct version you wish to remove.
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