Error 1603: A Fatal Error Occurred During Installation


When you try to install a software, the setup program might unexpectedly crash with the following error message:

Error 1603: A fatal error occurred during installation

Download the Diagnostic

There are certain situations when missing entries in your registry and registry corruption causes this problem. Try running a registry scan to identify if there are any such issues.

  1. Click the button below to download and install the Diagnostic
  2. Perform a Registry scan and fix any problems detected.
  3. Restart your computer.

Estimated Download Time: 10 Seconds

Correct Folder Security Permissions

The setup might have failed to access the folder you selected for the installation. Grant full access permissions to the folder in question, and then restart the installation process.


For Windows 10/ 8.1/ 8/ 7/ Vista:

  1. Double-click This PC or My Computer icon depending on the Windows version.
  2. Open the destination directory and right-click your installation folder. For example, C:\Program Files (x86), C:\Program Files
  3. Choose Properties.
  4. Click Security Edit.
  5. Check-up all items under Allow column-head to provide administrative privileges to the installation folder.
    • Full control
    • Modify
    • Read & Execute
    • List folder contents
    • Read
    • Write
    • Special permissions
  6. Click OK twice.

Make More Space For Installation

Your computer may not have enough storage space available on the drive selected for installation. The workaround in such cases is to clean-up temporary files, temporary Internet files, and cache contents.


For Windows 10/ 8.1/ 8/ 7/ Vista:

  1. Double-click This PC or My Computer.
  2. Right-click the system drive C:\
  3. Choose Properties.
  4. Click General tab > Disk CleanUp.
  5. Wait for the Disk CleanUp to automatically determine the size of temporary files.
  6. Check-up the directories you want to clean and click OK.

Enable Short File Name Creation

When enabled, the Short File Name Creation feature shortens target file names especially when the target volume does not support long names. Prevent error 1603 from occurring again by enabling this feature again.


For Windows 10/ 8.1/ 8/ 7/ Vista:

  1. Press Windows Key R.
  2. Type RegEdit, click OK.
  3. Locate the following sub-key:
    • HKEY_LOCAL_MACHINE | SYSTEM | CurrentControlSet | Control | FileSystem
  4. Set the NtfsDisable8dot3NameCreation= 0


  • If no string is found with NtfsDisable8dot3NameCreation name, right-click the FileSystem. Select Edit New | String Value.

Change Installation Drive

The drive you selected for installation may not have adequate storage space. Try installing the program in a different partition, for example, drive D:\.

Restart Windows Installer Service

The Windows Installer Service manages installation configurations, uninstall data, reference counting, and self-repairing data. If the service has been already stopped, Windows Installer may not function correctly. Fire up the Services tool to re-start it again.


For Windows 10/ 8.1/ 8/ 7/ Vista:

  1. Press Windows Key + R.
  2. Type Services.msc
  3. Hit ENTER or click OK.
  4. In the Services tool that opens, right-click the Windows Installer service.
  5. Choose Start.

Temporarily Disable Antivirus

Fatal error 1603 can also likely be a result of conflicts between the setup program and your Antivirus software. The general rule of thumb is to temporarily disable the Antivirus software during the installation process.


For McAfee Antivirus Plus:

  1. Right-click the Antivirus icon.
  2. Select Change Settings | Real-Time Scanning.
  3. In the new dialog that appears, click Turn Off.

For Kaspersky Internet Security:

  1. Right-click the system tray icon of your Antivirus software.
  2. Select Pause Protection.
  3. In the confirmation prompt that appears, select a time interval (30 minutes), and then click Pause Protection.

1 Comment

  1. Ava Robes

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