Z500 8.1 Windows 64-bit USB ports not working not

Hi everyone, now I have bought a lenovo Z500. After update to 8.1 Windows 64 bit, USB flashdrives could not run properly eventually Explorer Windows did not. When I try to restart, it blocks on the screen "Restart" and I have to press and hold the power button to power unit off which is very dangerous for the laptop. Other usb devices work well as a drive external hard, mouse and keyboard. USB flash drive only have such a problem. When I insert my USB key, I hear the sound which indicates that a device has been inserted. It is not the usb flash drive, because I tried with different USB keys and the same thing happens. All USB keys works well on my desktop (Windows 7).

Thank you..!!

After you uninstall a software firewall, USB port, back to normal.

Thank you.

Tags: Lenovo Notebooks

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