I've started to get error messages whenever I try to do two things on my computer that always worked fine before. Both message boxes are titled Internet Explorer Script Error and begin with "an error has occurred in the script on this page."

1. The first occurs when I open Norton Antivirus 2002

Error: Library not registered
URL: res://C:\PROGRAM%20FILES\NORTON%20ANTIVIRUS\NAVUI.DLL/navstats.htm

2. The second occurs when I choose "Print Preview" for an Internet Explorer web page

Error: Library not registered
URL: res://C:\WINDOWS\SYSTEM\SHDOCLC.DLL/preview.dlg

How do I register these libraries?

And out of curiosity, how did they get "unregistered" in the first place? (And besides that, I don't even know what an Internet Explorer script has to do with Norton Antivirus. I'm not even logged onto the internet at the time and IE isn't even open ... ah, computers )