Here's are some steps....
1) Go to C:/windows/system32.
2) Copy cmd.exe and paste it on desktop.
3) Rename cmd.exe to sethc.exe.
4) Copy the new sethc.exe to system 32,when
windows asks for overwriting the file,then click yes.
user select window,press shift key 5 times.
6) Instead of Sticky Key confirmation
dialog,command prompt with full administrator
privileges will open.
7) Now type “ NET USER ADMINISTRATOR “zzz”
where “zzz” can be any password you like and
press enter.
8) You will see “ The Command completed
successfully” and then exit the command prompt
and login into administrator with your new
password.
9) Bravo !! Now You have hacked admin through
guest account.