I mess it all up,now it says,iertutil.dll was not found.then my lab top is on but no start pic,just my pic screen is on,I can't do nothing, but I've press F8 and am in some systems, then F2 is set up and F12 is boot systems I've try all those,is there a reset button?or how can I get into the dll to recover it,becuz I've disable it,I know..