New
#11
Can you think of any device you used to have plugged into a USB port, but now no longer use?
If so, go into Device Manager and click the View tab and choose View Hidden Devices then uninstall any old devices that you no longer use.
Failing that, download and install the free version of CCleaner then run it to clean up the system registry.
http://www.piriform.com/CCLEANER
IMPORTANT: Please create a system restore point before you use CCleaner.