ObjectDock uninstall error, please help

[CHAoS_NiNJA]

Hey all, My friend recently had a computer donated to him by a kind gamer after his own was lost in a fire. It works well but had ObjectDock installed, and we removed it in favor of RocketDock. However, every time we boot up, we get an error message:

Title: ObjectDock - Cannot start, please reinstall

ObjectDock is not registered correctly. Please reinstall.

Now, I don't know how legal this copy of ObjectDock is, hense the uninstall, so registering is simply not an option. Can anyone else help me clean this PC up and get rid of this error message?