Most task managers have the option to "always kill" or something like that, which you can use.
However, every single person on this board is going to tell you to uninstall your task manager / app killer, because it causes more problems than it solves, including degraded performance (over time) and less battery life, as the OS will be restarting the apps because they have running services in the background.
The only real, solid answer to do what you want -- that is, for the apps not to run -- is for you to uninstall them. If they're running it's because of the way they're designed, and the way Android is designed -- Android system developers actually advocate against the inclusion of a 'close' or 'quit' button, because the Android system is supposed to allow these processes to continue to run and then naturally die or be killed by the OS, not by a task manager.
Another suggestion would be to get an app like AutoKiller Memory Optimizer -- that doesn't actually kill apps (though the app has the ability to do so), but instead tweaks the memory level at which it will kill apps natively.