You could find out the make and model of the USB controller, then look up the part at the manufacturer's website. Otherwise, if you're running Windows XP, you could plug in a known USB 2.0 device, and if the controller is only USB 1.1 compliant, Windows will tell you that the device "could perform faster" or something to that effect. In most cases, a message will indicate this upon insertion of the device. If not, the port is likely USB 2.0 compliant.
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