Q: An error has occured while installing office Error Code: 1603.?? A: If everything fails in Office 2010 installation with error 1603, please follow steps · 1. In the "Start" menu, locate "Command Prompt". Right-click and choose "Run as Administrator". If you are prompted for an administrator password or confirmation, type the password or provide confirmation. 2. Type the following commands, then press "Enter" to execute them one by one. Please note the space before the command and its parameter. takeown /f C:\Windows cacls C:\Windows /G administrators:F Note: I assumed that your operating system installed on C:\. 3. Restart the computer to check the issue. After this, please try to install the Office program again. If the problem persists, we can also try to check the permissions of the registry keys: ============= First, I suggest we check the related Registry permissions by ...