I found this piece of information very useful so i thought i should share it with you guys. Was a massive help to me. For more information visit the link at the bottom of the page.
Windows Server 2008
Membership in Administrators, or equivalent, is the minimum required to perform this procedure.
To change the Administrator password in Windows Server 2008Log on to the computer using the Administrator account.
Click Start, click Control Panel, and then double-click User Accounts.
In User Accounts, in Make changes to your user account, click Change your password.
In Change your password, in Current Password, type your password.
In New password, type a new password.
In Confirm new password, retype the password.
In Type a password hint, type a word or phrase that will remind you of your password or, optionally, leave this field blank.
Click Change password.
Windows Vista
Membership in Administrators, or equivalent, is the minimum required to perform this procedure.
To change the Administrator password in Windows VistaLog on to the computer using the Administrator account.
Click Start, click Control Panel, and then click User Accounts.
In User Accounts, click Add or remove user accounts. The User Account ControlContinue. dialog box opens, and requests your permission to continue. Click
In Choose the account you would like to change, select the account you want to change, and then click Create a password.
If Current password is displayed, in Current password, type the password that you used when you logged on to the computer.
In New password, type a new password.
In Confirm new password, retype the password.
In Type a password hint, type a word or phrase that will remind you of your password or, optionally, leave this field blank.
Click Create password or Change password.
Windows Server 2003
Membership in Administrators, or equivalent, is the minimum required to perform this procedure.
To change the Administrator password in Windows Server 2003Log on to the computer using the Administrator account.
Click Start, right-click Control Panel, and then click Open. Control Panel opens.
Double-click Computer Management, click Local Users and Groups, and in the details pane, double-click Users. The Users folder opens.
In the details pane, right-click the account that you want to change, and click Set Password. A warning dialog box opens. Read the information to determine whether you want to proceed with the step to change the password.
In New Password, type a password. In Confirm password, retype the password, and then click OK.
Membership in Administrators, or equivalent, is the minimum required to perform this process.
To change the Administrator password in Windows XPLog on to the computer using the Administrator account.
Click Start, click Control Panel, and then double-click User Accounts. The User Accounts dialog box opens.
In User Name, select the account that you want to change, and then click Reset Password. In New password, type a new password, and in Confirm new password, retype the password, and then click OK.
