There are many ways to change this Administrator account name, but the following is considered the simplest and easiest to implement. Let Taimienphi.vn change the name of the Administrator account offline.
Rename the Administrator account on Windows
Step 1: From the Desktop, right-click My Computer and select Manage
Step 2: Click here System Tools -> Local Users and Groups -> Users. In the right pane, right-click on your account Administrator then select Rename
Step 3: Here you can change this account name.
Above we have shown you how to change the Administrator account name on windows to ensure the security of the system, with this presentation, you can easily and quickly do it. Also you can refer to more ways Activate Administrator account in Win 8 here