How to Fix Fix Windows Error 0x80070671 — Installer Service Could Not Be Accessed on Windows
Getting Windows error code 0x80070671? Installer service could not be accessed or MSI installation failed? Fix error 0x80070671 with step-by-step solutions.
Symptoms
You might be experiencing this problem if you notice:
- •Error 0x80070671 when installing applications via MSI
- •Windows Installer service reports access error
- •Software updates fail with installer service error
- •Programs fail to uninstall showing error 0x80070671
- •System Center or SCCM deployments fail with this code
- •MSI repair operations fail with this error
Common Causes
- ⚠Windows Installer service stopped or disabled
- ⚠Corrupted Windows Installer registration
- ⚠Insufficient permissions to access installer service
- ⚠Another installation already in progress locking the service
- ⚠Group Policy restricting Windows Installer operations
- ⚠Corrupted Windows Installer cache files
Solutions
Solution 1: Restart Windows Installer Service
- 1Press Win+R → type services.msc → Enter
- 2Find "Windows Installer" in the list
- 3Right-click → Properties
- 4Set Startup type to "Manual" (should not be Disabled)
- 5Click Start to start the service
- 6If already running, click Stop then Start
- 7Click OK and retry the installation
Solution 2: Re-register Windows Installer
- 1Open Command Prompt as Administrator
- 2Stop the installer service: net stop msiserver
- 3Unregister: msiexec /unregister
- 4Re-register: msiexec /regserver
- 5Start the service: net start msiserver
- 6Also register related DLLs:
- 7regsvr32 msi.dll
- 8Restart PC and retry installation
Solution 3: Clear Installer Cache and Repair
- 1Open File Explorer → navigate to C:\Windows\Installer
- 2Note: This is a hidden system folder — do NOT delete contents blindly
- 3Run system file check:
- 4sfc /scannow
- 5DISM /Online /Cleanup-Image /RestoreHealth
- 6Check for pending installations:
- 7Open Task Manager → check for msiexec.exe processes
- 8End any stuck msiexec processes and retry
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