On a MacBook Pro I uninstalled Tuxera NTFS. Never got a key. Decided not to use it.

Thought all was well. It's not. Every boot at least 3 of these error dialogs show up.
Which is annoying my client.

How to clean this off is what I need to know. I'm a computer tech but mostly windows. How do I do it on the MacBook? It's running Snow Leopard 10.6.8

Thanks!