Norton antivirus auto protect error????

I’ve installed Norton Antivirus 2001 on w2k PDC server. I’m getting the 2 small popup windows & following errors in event viewer every time I log on to my pc.

Event Type: Error
Event Source: NAV Auto-Protect
Event Category: Virus Found
Event ID: 33158
Date: 10/17/2001
Time: 1:25:54 PM
User: N/A
Computer: W2K
Description:
Unable to get Virus Definition Dates

Event Type: Error
Event Source: NAV Auto-Protect
Event Category: Virus Found
Event ID: 33160
Date: 10/17/2001
Time: 1:25:56 PM
User: N/A
Computer: W2K
Description:
Unable to start the definition monitor

Tell me where the problem lies & whats its remedy? I’m getting same errors on NT4 member server running NAV 2001.