My sister has a Acer Aspire 5742 laptop (Originally win 7) but runs w8.1. She has not used it for a while and has forgotten the password that is required to get into widows. So it's locked on the P/W screen with the Username (Email address) and p/w entry slot. I can not get into windows including safe mode. So the main question is how can I unlock the p/w entry so at least I can gain access and change the p/w.