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I have an Acer Aspire V3-551-881. After upgrading to Windows 7 Professional for some reason my 3.0 usb port doesnt not work correctly. It delievers power as in I could plug my usb phone charger in and charge up my phone but it refuses to recognize any external usb devices. It doesn't even beep when an external usb is plugged in. I was thinking that I would have to update the drivers for the usb port but I can't find where to download to files even after searching this website for ours. So could someone point me in the right direction to download the drivers for the 3.0 usb port or tell me if it's something else that's wrong with it. Thank you.