FINALLY!!! I've been wanting to do this for ages since I have several laptops with only USB 1.0 hubs.
The problem:
Whenever I plug-in my USB flash drive or wireless card (both of which are USB 2.0 devices), I get the annoying ballon/message pop up stating "This Device Can Perform Faster" (if plugged into a USB 2.0 port etc).
The solution:
In Device Manager, click on the USB host controller,
Click the Advanced tab
Check the box on the bottom of the window that says "Don't tell me about USB errors."
This needs to be done for each USB controller listed under USB in Device Manager so that the error message will not appear no matter which controller the device gets plugged into.