Hi,
First check if the original installer (if it came with one) has an uninstall option. This usually sits just before you select the drive to install to.
If there is no uninstaller there, search through the menus, there may be something like "Remove ..." or similar.
Failing all the above, start the activity monitor, find your running app, select it and kill it - red stop sign on the toolbar. Once inactive, you should be able to delete it.
Or see if it is in the Login Items under your user account, if so remove it from there (minus button), restart and try trashing it.
Message was edited by: i.3d