Did you forget windows logon password? You will need windows DVD or bootable Flash Drive Having Windows 8, 8.1. And you could be needing positively continue reading. 5-pages.
Page 1: Select your DVD or flash drive using up down button & hit Enter
Insert Windows DVD OR Bootable Flash Drive and after inserting required Media, restart your computer.
While starting Press the Boot key on Keyboard, boot key varies by computer Manufacturer. Generally it is from F2 - F12 For HP - F9 Dell - F2 or Check on google.