Change Guest Account to Admin
In this tutorial I will show you how to change a guest account to an admin account. If you didn't get my instructions, here they are:
shutdown the computer
on start up hit f8
select safe mode
click on the administrator account
now run cmd.exe
in cmd type net localgroup administrators /add (username)
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And there you go
This should work on computers up to XP
*I'm unsure about vista