Windows errors

'Windows Installer' service error when installing or uninstalling programs

Trying to install or uninstall a program results in an error related to the Windows Installer service, sometimes with a code, preventing the setup process from completing.

Difficulty
Moderate
Time
30–60 minutes
DIY cost
$0
Pro cost
$80–$150

Symptoms

  • Error message specifically mentions Windows Installer
  • Happens when installing or uninstalling various different programs, not just one
  • May include a specific error code
  • Installer may hang or close unexpectedly

Likely causes

  • CommonWindows Installer service stopped or not runningThis background service is required for any .msi-based installation or removal to work.
  • CommonCorrupted Windows Installer cacheDamaged cache files can cause installer operations to fail across multiple programs.
  • PossibleConflicting security software blocking the installer serviceSome antivirus tools interfere with installer operations.
  • PossibleCorrupted system files affecting the installer componentBroader system file damage can affect this shared Windows component.
  • Less commonGroup Policy restricting software installationOn managed or work computers, policies may intentionally restrict installations.

What to do

  1. Open Services (search 'services.msc'), find 'Windows Installer,' and confirm it's not disabled; set its startup type to Manual if it's currently Disabled, then restart the computer.
  2. Run the Microsoft Program Install and Uninstall Troubleshooter, available directly from Microsoft's support site, which automatically fixes many common Windows Installer issues.
  3. Temporarily disable third-party antivirus software and try the installation or uninstallation again.
  4. Run 'sfc /scannow' and 'DISM /Online /Cleanup-Image /RestoreHealth' to repair any underlying corrupted system files.
  5. Restart the 'Windows Installer' service manually: open an administrator Command Prompt and run 'net stop msiserver' followed by 'net start msiserver.'
  6. If on a work or school computer, check with IT whether a policy is intentionally restricting software installation.
  7. If errors persist across many different programs, consider creating a new Windows user profile to see if the issue is specific to your current profile's settings.

When to call a pro

If the Microsoft troubleshooter and service restart don't resolve Windows Installer errors, a technician can dig into deeper system file or policy issues affecting it.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.