Are you by any chance running NAV 2004 with Autoprotect on during system
boot?
To disable the Auto-Protect advanced option, perform the steps provided
below:
1. Start Norton AntiVirus (NAV).
2. Click on Options.
3. Double click on Auto-Protect under System.
4. Click on Advanced.
5. Under 'How to increase Windows start up protection' uncheck 'Load
Auto-Protect during system boot'.
6. Click on OK.
7. Restart the computer and check whether the issue persists.
To check whether your Norton AntiVirus is working properly, you can perform
an EICAR test. Refer to the link provided below to perform an EICAR test:
Title: 'How to use the EICAR test string to test Norton AntiVirus'
Document ID: 19975295056
Web URL:
http://service1.symantec.com/SUPPORT/nav.nsf/docid/19975295056