How To Hack and Bypass Windows Login if you have forgotten your windows XP,vista,7,8.1 password then this guide will help you to recover your PC without having to reinstall the OS. In this guide, we will show you how to bypass a Windows XP,  Windows Vista, Windows 7, Windows 8,  Windows 8.1 and Windows 10 logon password. For this tutorial we will be using a software called KON-BOOT