Windows 7 changing login user name

[samwawa]

I'm using Win 7,
I have only one user name registered in the computer
my login user name was changed to wrong name by external software,
I can not find the way to enter as my original user?
how can I change the name of the user name when logging in?

 

[Pauli]

You could try to restore your system to an earlier point. Choose a point before installation of the troublemaker.

How to System Restore From BIOS | eHow.com