In an effort to make a network more secure you may modify both the name and password of the local administrator account for all of your Microsoft Windows workstations by applying a Group Policy Object (GPO) to the organizational unit (OU) that contains those workstations.
To modify the local administrator username and password open the Group Policy Management Console (GPMC) and create a Group Policy. This may be done by right clicking the Group Policy Objects organizational unit (OU) and selecting New. Additionally, you may right click the OU that contains the desktop(s) of your user(s) and selecting Create a GPO in this domain, and Link it here…. In the new New GPO dialog box name the GPO Modify Local Administrator Account. Right click the newly created GPO and select Edit…from the context menu. Once the GPO opens navigate to the following setting.
Computer Configuration > Preferences > Control Panel Settings > Local Users and Groups
Right click Local Users and Groups select New > Local User.
In the New Local Users Properties dialog box enter the following information:
User name: Administrator
Rename to: <new username>
Confirm Password: <password>