Don't feel bad, believe me everyone here has their fair share of "D'oh!!" moments. Me especially.
Just as an aside, if you want to kill a specific process, one option is to open a console session then enter the "top" command. (Top shows you the processes that are running, in descending order of the amount of CPU they're using.) If you see a runaway process, you can kill it by issuing this command
where <pid> is the Process ID. The PID column is to the far left in the "top" results. To illustrate, if amorak happened to be process ID 5477, then to kill it you would enter
Take care when manually killing any processes; if you supply the wrong PID you can crash something that you didn't want. -- J.W.