I'm having a similar problem: the NIS 09 icon does not appear in the tray.
It did the day I installed it (couple days ago), but not since. NIS is running properly, I just can't see the icon. Not even after restarting and running many hours.
I can't make it appear or set it to "always show," because it doesn't even show up as an option when customizing the tray.
I've seen other threads on this, not sure of a solution yet.
I tried Vineeth's "Services and Applications" suggestion above, but it didn't work for this. Before meddling with the registry, I figured I'd ask if yogesh's suggestion was worth a try. However, I did check my registry and "TrayNotify" is not in the stated location (that path doesn't even exist in my registry). It's in HKEY-CURRENT_USER/Software/Microsoft/Windows/CurrentVersion/Explorer. Does this matter?
Thank you!
XP Pro, SP3
[edit: changed subject to better reflect thread topic]