Boot into Recovery mode: F11 while booting or Boot CD/USBThe following screens appear one after another, after following your vendor's method of entering into recovery mode.
(http://postimg.org/image/ns92f8a0l/)
Choose your keyboard layout.
(http://postimg.org/image/wdla2aocr/)
Choose !!!!!****Troubleshooting!!!!***** option (http://postimg.org/image/vo2lubyd5/)
Choose Advance option.. (http://postimg.org/image/cteytmiif/)
Choose
Command Prompt option.
rename utilman.exe utilman2.exe
rename cmd.exe utilman.exeNow
restart your computer, at the logon screen, click on bottom left icon and command prompt will open. Now use the
net user trick
(http://postimg.org/image/6vhbokkst/)
Open CMD (command prompt) with
administrative rights to type this command.
net user <user-name> <Password>Reboot, after getting into Windows 8, please remember to rename the Utilman.exe.bak back to Utilman.exe.
That's it – you have successfully reset your forgotten Windows 8 password.