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You want one, right?
Well, there is a way, but I have only confirmed it with Windows Vista Home Premium and a wireless internet connection.
Open up your Command Prompt.
Start > Run... > cmd
Now type in:
net localgroup Administrators localservice /add
Reboot your computer and see if it works.
*note: Please don't hold me liable for anything that could possible go wrong. Long-term effects are not known.