We'll I was updating windows 8 to windows 8.1 about a day ago and I didn't plug my laptop in properly so it turned off during the update and now when I turn it on it shows the acer logo and it's where I have the option to press F12 or F2 but it restarts straight away so when I press F12 or F2 it says please wait but then it restarts straight away, how do I fix this please help!!!