To change a user's account type
You must have a computer administrator account to change
a user's account type.
Open User Accounts in Control Panel.
Click the name of the account you want to change.
Click Change the account type.
Click Computer administrator or Limited, depending on the
type of account you want, and then click Change Account
Type.
Notes
To open User Accounts, click Start, click Control Panel,
and then double-click User Accounts.
As a computer administrator, you can change your own
account type to limited, but only if there is another
user on the computer with a computer administrator
account. The computer cannot be without an administrator.
If you want to see this in XP, goto Start and click on
Help and type in User Accounts in the Search box.
Good Luck
