PC controller

So, as it is impossible to play some games with two players without a 2nd controller (Lord of the Rings: Return of the King) I need a controlling device besides my keyboard and mouse to control the game with. I have tried going to radioshack and all they had that I could get were corded gigaware PC controllers which suck. If I try to look up I look left, if I look down, i look right. If I run in a diagonal line, I look up. I have calibrated and even tried using Xpadder on it and nothing works. I finally got around to looking up the controller and it has met with poor reviews. So finally I'm thinking about getting a 360 controller and using it for my pc, but i don't know how to do that, I just know you can. So where can i get them w/ the alleged software disc you need for it to work with pc?