deleting app...but still running.

I deleted kaspersky security by going dragging it too app cleaner. and its not within applications or anywhere on a search.

I thought this would mean it is deleted, however on startup it pops up and also has the K up top right at clock.

I'm doing a fresh install so if it cant be fixed I'm not worried, i'd just like to know how this happens.
I see it has an uninstaller if i re download the app, but is that always the case with apps that have uninstallers, that is, that if you delete it and not uninstall it will remain on the system?