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This will show you how to fix the error :
The User Profile Service failed the logon. User profile cannot be loaded.

How to Reset a User Account Password in Vista

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If you forgot the password for a user account, this will show you how to reset or change the password to gain access to the user account again.

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When you log on to Vista using a temporary profile (user account), and you receive this error message:

Your user profile was not loaded correctly! You have been logged on with a temporary profile.

How to Prevent or Allow a User to Change their Password in Vista

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This will show you how to Allow or Prevent a selected User Account from being able to change their password from User Accounts in the Control Panel (Classic View).

How to Turn User Account Control (UAC) On or Off in Vista

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This will fully explain what User Account Control (UAC) is and how to turn it on or off in Vista.

How to Delete a User Account in Vista

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This will show you how to delete a user account with the option to save the contents of this soon to be deleted user account's personal user folders into a folder on the desktop of the Administrator account it is being deleted from.

How to Delete the Windows.old Folder in Vista

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If you performed a custom installation, without formatting the drive for a clean install, and selected to install Vista on the same partition of the previous installation, then this will show you how to delete the Windows.old folder generated during installation.

How to Change or Stop Password Expiration in Vista

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This will show you how to change when or stop Password Expiration for a user account in Vista.

How to Set a Default Logon Display Picture for All Users in Vista

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This will show you how to change the default user logon picture to what you want and set it as the default logon picture for all users on the computer without it being able to be changed by the users in Control Panel User Accounts.

How to Rename the Vista Guest Account

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This will show you how to rename the default Guest account name to a name you like instead to be displayed in the log on screen and Start menu in Vista.