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If using windows 7 First, please disconnect all USB devices and then perform the following steps: Click 'Start' button, type 'devmgmt.msc' (without quotation marks) in the 'Search' bar and press 'Enter'. Click 'Continue' if necessary. In Device Manager, double click to expand 'Universal Serial Bus controllers', right click on the Host Controller, click 'Uninstall' and click 'OK'. Repeat the step 2 to uninstall all items under 'Universal Serial Bus controllers'. Then, restart your computer and Windows 7 will reinstall all USB controllers automatically click start control panel administrative tools computer management device manager scroll down universal serial bus controllers you could see a yellow question / exclamation mark?!