Uninstall all the USB port. To do so:
Click Start>Control Panel>Hardware and Sound>Device Manage (click View hardware and devices)>Click the (+) sign to expand it, you will a list of USB devices, right click on each of them & click UNINSTALL and then restart the computer. Now, try using USB device.
You can restore the computer back to factory default,to do so, follow the below steps:
Turn Off the computer, now as soon as you hit the power button, keepon holding "Alt" + keepingon tapping "F10" key, i.e Alt+f10, it will open the recovery console, select full factory restore and follow onscreen instruction. NOTE: This will erase all the datas on the computer.
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