Hi,
- Were there any recent changes made on the computer prior to the issue?
Let’s follow these methods and check if it helps.
Method 1: Run hardware and devices troubleshooter and check.
http://windows.microsoft.com/en-us/windows7/Open-the-Hardware-and-Devices-troubleshooter
Method 2: Reinstall USB controllers.
This method resolves steps where the currently loaded USB driver has become unstable or corrupted.
a. Click Start, then type device manager in the Search box, and then click Device Manager.
b. Expand Universal Serial Bus controllers. Right click a device and click Uninstall. Repeat for each device.
c. Once complete, restart your computer. Your USB controllers will automatically install.
d. Check the issue.
**Update a driver for hardware that isn't working properly******
For more information, refer to the link.
**Tips for solving problems with USB devices** (Applies to Windows 7)
Do let us know about the results. We will be happy to assist you further.