I recently upgraded my wife's MacBook (3 years old) from Tiger to Snow Leopard using the full Snow Leopard CD. (not the $29 upgrade) She used to have a Kensington MouseWorks wireless mouse with Tiger, but hasn't used it in over a year and doesn't plan to anymore. The problem is I can't get rid of MouseWorks Background process that is still running. When I kill the process in the Activity Monitor, it is there the next time the computer is rebooted. Any ideas for the safest way to permanently remove this process?