How to change the type of a user account in Windows Vista?

Please refer to the following contents

According to the following operation steps, you can change the type of a user account.

1.Click the Start button, and then select the Control Panel.

2.Click Add or remove user accounts under the Manage Accounts tab.

3.After displaying the User Account Control message, click the Continue button.
For standard users, please refer to the following related information.
[Windows Vista] About User Account Control

4.If the User Account Control message doesn’t appear, please refer to the following steps.
5.Select the account you want to change.

6.Click the Change your account type.

7.Choose the items of the user’s account categories you want to change, and then click Change your account type button.