"The Windows Installer Service Could Not Be Accessed" error when you try to install a program in Windows 7 or Windows Vista

Applies to: Windows 7 EnterpriseWindows 7 Home BasicWindows 7 Home Premium


When you try to install a program in Windows 7 or Windows Vista, you receive the following error message:
"The Windows Installer Service could not be accessed. This can occur if the Windows Installer is not correctly installed. Contact your support personnel for assistance."


To resolve this issue, use Method 1. If Method 1 does not resolve the issue, use the next method that is listed until you resolve the issue.
This issue occurs when one or more of the following conditions are true:
  • You install or remove a program that uses the Microsoft Installer Service before you try to install the program on your computer.
  • The Windows Installer Service is not running.
  • The Windows Installer registry settings are corrupted or configured incorrectly.
For more information about this issue in Windows XP and Windows Server 2003, click the following number to view the article in the Microsoft Knowledge Base:
315346 Error message when you try to add or remove a program on a computer that is running Windows XP or Windows Server 2003: "The Windows Installer service could not be accessed"