In Windows Vista and Windows 7 the Administrator account is created , but since it’s not enabled you can’t use it so if you want to use it for any troubleshooting.
To Enable the Administrator Account in Windows use the below procedures :
You need to open a command prompt by right-clicking and choosing “Run as administrator” option.
Now type the below command:
net user administrator /active:yes
To check, Log off from the current user and try to login with Administrator user 🙂