Changing your own account is just a little different from changing other users’ accounts. Follow these steps:
1. Choose Start > Control Panel and then, under the User Accounts and Family Safety heading, click the Add or Remove User Accounts option.
2. Click the icon next to your own username.
You see the Change an Account dialog box.
Most of the options for your own account mirror those of other users accounts. One key difference is that you can’t delete your own account. Another is that you can’t turn yourself into a standard user if only one administrator account is on the computer Windows has to protect itself. Every PC must have at least one user with an administrator account. If Windows 7 lost all its administrators, no one would be around to add users or change existing ones, much less to install programs or hardware, right?
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Gary - InternetFixes Support.