You may get the following error on your PC screen when you try to install a Microsoft Windows installation package.
Error 1603: a fatal error occurred during installation.
This error prevents you from installing the Windows Installer package and when you click the OK button, installation backs up. This error also appears when you try to install Skype. Mostly, this error appears in Windows 7, Windows 8, Windows 8.1, Windows 10, Windows Server and Windows Vista. Most of the time, This issue occurs when you upgraded your operating system from a lower version to a higher version or upgraded Windows 10 Recently.
Cause
Principally Error 1603: a fatal error occurred during installation occurs when some of the important system files are missing, as .dll files, .sys files, etc. Damages caused by viruses or malware also generate this problem. It is very difficult to browse all system files manually, so the best idea is to use Advanced System Repair to fix the error code 1603. Has more than 25 million files in the database, so it scans for all corrupted or damaged Windows files quickly and repairs or reinstalls them automatically. It also repairs the damage caused by malware, ransomware, spyware or virus.
SOLUTION
Method 1: fix using advanced system repair tool
The most common reason behind Windows Installer error is corrupt or damaged system files like dll files, exe files, sys files, etc. There are hundreds of small system files that work for specific tasks. If one of the files is replaced, removes or damages, you may get the error 1603 Windows Installer.
Download and install the advanced system repair tool and scan your PC. It has a large database with 25 million files. It will find all corrupted or deleted system files and reinstall them with a new one. Later, optimizing with advanced system repair tool, try to install the windows installation package.
Cause
You will get the error 1603 Windows Installer under the following conditions:
1. When the Windows installer is installed, there is an application already installed on your PC.
2. The installation folder is encrypted where you want to install Windows Installer.
3. The installation drive is being used by other services or programs.
4. The installation folder does not have all the necessary permissions.
Method 2: fix it yourself
With the purpose of fix the error code 1603 manually, follow the next steps:
1. Reinstall the conflicting app: Go to the control panel and uninstall unnecessary software that is no longer in use. Find the application shortcut icon and, if you find that some application is missing the shortcut icon, point to that app. Uninstall them, restart your PC and try Windows Update again or install the Windows update package.
2. Change installation folder: During the installation of the Windows Installer package, change the destination folder if installation asks you to choose a folder. In this way, you can skip the encrypted folder installation and you can install the package in your custom folder.
3. Change installation unit: You must change the installation drive. It is possible that the drive you are using for the installation of the Windows installation package is being used by another program. So, you can get fatal error 1603 during the installation.
4. Grant full access permission to system accounts: Are you logged in with the administrator? But, first log out and then try to log in as administrator. After logging in as administrator, do the following:
A) Open MyComputer and right-click on the drive where you want to install the Windows installation package.
B) Ir Safety tab. Check it SYSTEM user account appears in Group or user names. If it is not in the list, add it using the following methods.
C) Click Edit then click on Add. Please select Users the group.
D) Circumstances SYSTEM in the object name field and click OK.
ME) Now change the permission to full control of the SYSTEM account.
It is not difficult to correct the error 1603 if you use the answer from advanced system repair tool. This tool is specially designed to track and fix all kinds of Windows operating system problems..
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