Vista, as XP, has an account called "administrator" but it is hidden and not enabled by default. For this account to appear in the list of users to the home screen, the method is different depending on whether one uses a "family" of Vista or a professional version (or Ultimate).

For versions Pro easiest way is through users and local groups (lusrmgr.msc)
Just right click on Administrator properties and then uncheck the "Account is disabled"

For versions "family" we must proceed in two stages:
  • Creating the Administrator key in the registry
  • Activating the Administrator account



Creating the Administrator key in the registry
Getting to:
HKEY_LOCAL_MACHINE\ SOFTWARE\ Microsoft\ Windows NT\ CurrentVersion\ Winlogon

Right-click on Winlogon -> New -> Key, give the name and validate SpecialAccounts.

Repeat the same operation by right-click on SpecialAccounts to create a subkey UserList and [validate].

In the window right in front of UserList, right-click -> New -> DWORD Value 32-bit and giving it the name Administrator with the value in 1 ticking decimal (right-click -> Change).

Close the editor ...

Activation of the Administrator account
The next step is to activate the presence of the Administrator account in the choice of user accounts at the opening session:

Open a command window (by clicking right to choose to do so in administrator mode) and type:
  • net user Administrator / active: yes (with a space between Administrator and /)


The notifications "The command has been completed correctly" confirms its proper implementation.

Close window Invites ...

The result is immediate, it is not necessary to restart. Suffice it to close the session to see administrator in the list.

If you want to hide again "Administrator", it is sufficient to bring the value to 0 in the registry.

Important
Attention, as in XP, it is preferable not to use this account for routine work. We must reserve the repair and / or changes requiring unrestricted access. Do not use it to surf the Net because the computer would be much more vulnerable.