Windows Installer package is a set of software components developed by Microsoft that helps in the installation, maintenance as well as removal of software in your Windows computer. If you are using Windows XP computer, there are chances that you will get errors while installing a Windows Installer package in your system. Here, you would get the following error message: A Fatal Error Occurred During Installation. According to technicians at the Microsoft problems and support chat number support, most of the times these errors occur when your SYSTEM account does not have Full Control permissions on the path where you want to install the Windows Installer package in your XP computer. According to the technicians, for repairing such an issue, you need to grant Full Control permissions to your SYSTEM account. You would also require administrative rights to perform the task of fixing this error message. You can try the following instructions to fix error code 1603 before contacting technic...