1. Log in to Windows with an administrator account.
2. Click 'Start' and click 'Control Panel.' Click 'Programs' and 'Programs And Features.'

3. Scroll through the list to the program with the fatal error during installation. Click the program's file name and click 'Uninstall.'
4. Click 'Yes' in the warning message that appears to begin the removal process.
5. Restart your computer after the uninstallation is complete to save the changes to your computer's settings.