Macjanitor. cannot run tasks

even since i installed leopard i cannot run the tasks on macjanitor, the buttons are are grey'd out and o is the options to run the tasks on the apple menue bar, i have no idea why, i know it works with leopard i think, but it dosent work for me, i have tryed re-downloading it, but i cant fix the problem.

is there maybe another program like mac janitor that dose the same thing? just incase i cant fix this