I'm using windows 7 ultimate, i want to install windows 10 but when i'm installing the mouse and keyboard do not function during "keyboard type" choosing! Even mouse cursor is not seen i dont know what to do! I'm using lenovo G40-30 processor 2.16GHz intel! And 64-bit operating system. I tried even to install windows 8 but the problem is still there! Is there any one can help what to do! At that point only some are still functing but enter, escape windows are not!