The problem Tyrrael is describing is that an known issue with the "windows dongle" for the 360 controller is that it has a notoriously sketchy fuse and USB is notoriously sketchy in amp/voltage regulation. It is easy to bust the fuse and end up with a non functional receiver for the controller. You can try to replace the fuse but they are not easy to find and require skill to replace.
Basically, after going through this myself I came to the conclusion I should have just gone with Logitech. :/