1. Log in by using another administrative account.
Note You may need create a new administrative account at first.
2. Go to the C:\users\ folder and rename the sub folder with the original user name to the new user name.
3. Go to registry and modify the registry value ProfileImagePath to the new path name.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\<User SID>\
WARNING If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
4. Log out and log in again by using the user whose name is changed, and the user should use the pervious profile with new path name.