Zonealarm 8 false positive?

Hi,

I’ve been running Zonelarm pro 8 and just switched my AV to Norton AV 2009.
Today’s ZL spyware scan flagged what I assume is a Norton reg key as a trojan:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\nav

win32.trojan.startpage.ajk

It that a legit Norton key and is this a false positive?

Thanks,
Dave