In Windows 8, administrator account is disabled by default like in Windows 7. The default user created during the installation of Windows 8 is the member of built-in administrator group and normal user task can be done with it.
But if you are troubleshooting something or you are a software developer who needs to develop and test software with Internet Information Services (IIS) or Microsoft Server Management Studio, you’ll need an account with administrative privileges, where you have full access to the system.
Following are the easy steps to Unlock Administrator Account in Windows 8
Activating the Account:
1. Go to Control Panel -> System and Security -> Administrative Tools
2. In Administrative tools Double click Computer Management
3. In Computer Management expand Local users and groups -> Click on the Users Folder -> Right click the Administrator then click on properties from the context menu.
4. Uncheck Account is dissabled to enable the administrator account. Apply
Note: Administrator Account’ has no password by default so your system may be vulnerable to security risks.