Unknown device

HP Notebook model: ENVY m6. Windows 8.1 operating system. Suddenly missing and cannot find the device appropriate for the hub driver USB root. Tool «Updare Driver...» "in the Device Manager could not find the driver, possibly the INF, lack of information/entry required. A couple of days, it's fine. Any help will be appreciated, thanks.

The problem has been fixed by restoring the system to a certain point of restoration. Thanks to everyone who responded with suggestions.

Tags: Notebooks

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