Unplug 1 USB device from your computer. USB devices are "hot-swapable", so you do not have to turn your computer off or restart it to unplug/plug a USB device. Now on that screen, where you see the exclamation mark, press F5 on your keyboard. This refreshes Device Manager. You can also Right-click and select Scan for new hardware, if you want to make sure it refreshed correctly.
If that USB device with the exclamation mark disappears, then you found the device that you need to reinstall the software/drivers for. If it does not disappear, then you can plug it back in, and try another USB device.
If after trying all your USB devices, if none of them make it disappear, then I think it's safe to say we can ignore this "problem". If you ever notice a USB device not working, then you can come back here and let us know the situation. But it will probably just require its drivers to be reinstalled.
Let me know if you discover a USB device that belongs to that problem in Device Manager.
Edited by computerwiz12890, 12 September 2006 - 10:53 AM.