sometimes as windows starts it says the system cant find the file specified .its a keyboard driver i think ,and the keyboard neither works nor shows up in device manager when ever that error message shows up.its at system32/drivers/kbfiltr.sys ..but how do i tell windows that its there! …all i do is reboot and press the del key to enter the bios .(i think the computer is more sensitive to the del key!).return to windows (without making changes)..and it works.how?