After i did a system restore on my dell xps 14 ultrabook, one of the USB port (the one with powershare "thunder" symbol) is not working right now... while the other one seems like working well. and i don't see any problem on the device manager.

Intel® Core™2 Duo Processor E6600 (4M Cache, 2.40 GHz, 1066 MHz FSB) Intel® Core™2 Duo Processor E6700 (4M Cache, 2.66 GHz, 1066 MHz FSB)

My XPS 12 has been having problems with the touchscreen -- as other have reported -- where it will suddenly stop responding to inputs until I restart the PC. It seems as though this is a driver issue.