I went to the link below. I went to start, run and typed in winword.exe /a.
I can get in really fast but when I go to open a document, it hangs up. It
has something to do with scanning the file for viruses before I open it. I
also deleted Norton Virus scan and it's still doing this.
Deleting NAV is overkill; disabling its Office Plug-in will suffice. At this
point, you may have shot yourself in the foot if the .dll is still
registered.