All the following methods will confirm whether you have USB 2.0 installed in your machine or not.
In the Device Manager expand the Universal Serial Bus section. There should be an "Enhanced" USB host controller present.
Now navigate to the following key:-
The presence of the above registry key seems to indicate USB 2.0
Run this direct edit:- Test for USB 2 (Line 330, right column)http://www.kellys-korner-xp.com/xp_tweaks.htm