I just got my Xbox 360 controller in the mail, and realized it won't fit into any of the USB ports on my computer. Do I need some kind of adaptor? Some quick googling seems to indicate that usb 1 and usb 2.0 are compatible, but the plug on this controller is significantly larger than those of my mouse, joystick etc. 
Here's a picture. If it's not clear, the xbox usb is about a milometer taller and wider than the one for my keyboard.
There was also a plastic sheath around it the plug on the xbox controller that I removed, thinking it was packaging, but in retrospect, it probably wasn't
. But even with that removed it's too big to fit into any of my usb ports.
Here is a shot of the plug on the xbox controller:
Here's a picture. If it's not clear, the xbox usb is about a milometer taller and wider than the one for my keyboard.

There was also a plastic sheath around it the plug on the xbox controller that I removed, thinking it was packaging, but in retrospect, it probably wasn't
Here is a shot of the plug on the xbox controller:

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