When you don't access to Windows (Reset Password)

Option 1:

copy c:/windows/system32/sethc.exe to c:/ (backup)
copy c:/windows/system32/cmd.exe c:/windows/system32/sethc.exe
--when you restart, push shift key for 5 second, and put.

c:>net user

Option 2:
#mount /dev/sdax  /mnt/windowsc    (mount windows partition using linux)
#cd /mnt/windowsc/Windows/System32/config
#chntpw -l SAM  (for list users)
#chntpw -u SAM (for options)





References:

[1] https://4sysops.com/archives/forgot-the-administrator-password-the-sticky-keys-trick/

[2] http://www.howtogeek.com/howto/windows-vista/change-your-forgotten-windows-password-with-the-linux-system-rescue-cd/