From "Experts Exchange":


"Windows XP SP2 says "This device can perform faster" about all my USB 2.0 devices."

[..]

" To stop the warning (eg if you only have USB 1.1) go to device manager, find your USB host controller(s) double click and select advanced tab, then tick the box "don't tell me about usb errors" that should stop the bubble. You need to do this with all the controllers listed."