If you have the Mother Board drivers that came with the puter, do see if there is an installer for the USB 2.0 drivers included.
Remove the cords of n e USB devices that you have connected to your puter.
Then try to reinstall the drivers for the USB controller from here:
Go to start>settings>control panel>system>hardware>device manager>Universal Serial Bus Controlers.....and see if you have n e 'splats' : red/yellow/X icons on n e of the devices.
If so....highlite the device>click on remove>apply>ok.....then exit the panel and then restart your puter.
This will allow windows to reinstall said devices.