Fruit yLoops is Probably the best "easy" one out. But i'd recommend you download samples from elsewhere. It comes with a lot, but when people start using those all the time, it gets to the point where you don't want to hear them you know..haha.
Then, there's like Reason (Big Big File Size), Cubase, and some others. But you can't go wrong with some hardware/equipment, but you siad you weren't relly seirous, so Fruity Loops would be the way to go.