I have owned the Lenovo g560 in which windows vista was installed and my laptop was working fine. Now after some days I have upgraded my operating system with windows 7 and after installing the windows 7 I have installed all the drivers in my laptop. After installing the driver my laptop gives me the massage that one unknown device found and device ID is like Acpi\Vpc2004. now I donít know what is that but I am not able to remove this massage and my power management option is also not working. Any help will be appreciated.