Thank you for posting in the Microsoft Community.
I’m sorry to know that you are having trouble changing the user name in Windows 8 Professional.
I’m glad to provide you with these steps which will help you to change the user account name. Follow these steps:
a. Press Windows key + X and click
b. Select User Account
c. Under Make changes to r user account, click on
Change your account name
If you need further assistance, please reply and we will be happy to help you.
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