Hi korkie67,
We need more information about your issue.
Are all USB devices could not recognized by Windows? Or just one.
What kind of device cause the issue?
Did that device work properly before, or it is a new device for your computer ?
Please make sure you enable Windows update and its up to date.
Check if there is unknown device in your device manager. If there is, you could right click that device->properties->Driver, and perform an auto searching.
By default, since system has basic driver for general devices, this will not be an issue for small USB storage devices or basic device such as USB thumb or USB mouse without expansion capabilities. If your device has expansion capabilities or function, you might need to download driver from manufacturers.
Or you also could run a hardware and devices troubleshooter, It checks for common issues and makes sure that any new device or hardware attached to your computer was installed correctly.
About a hardware and devices troubleshooter(also apply to windows 8.1 )
http://windows.microsoft.com/en-us/windows7/Open-the-Hardware-and-Devices-troubleshooter
Regards
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