It is indeed harmful in other ways. As its name suggests, it is
a spyware. It logs your internet usage.
Have you downloaded anything recently? Especially when they IE
warned about the ActiveX controls?
Since none of NavExcel entries can't be found in the registry,
there are 2 possible reasons for it.
1) Norton cleared it.
2) You looked in the wrong registry key.
As for the CPU usage, it could be due to unstable programs that is
causing it to reach the peak for that day. IE is usually the
culprit. Usually, ending the process directly from task manager and
restarting would solve it. Norton Antivirus is also another
culprit, because they work in the background. But you can't end any
of Norton Antivirus process, so you have to restart computer if it
starts reaching 100% again.
