Windows XP - Error: The Windows Installer Service Could not be Accessed
This document provides a solution to the error message: "Windows Installer Service could not be accessed".
NOTE: Windows 95/98, Windows Me, Windows 2000, and Windows XP are no longer supported by the Help Desk. We can only provide best effort support. If we are unable to resolve your Windows 9x/2000/XP issue, you may be able to find help in Microsoft's Knowledge Base.
These products are no longer actively supported by Microsoft. No further development will take place on these products and security updates are no longer issued. It is highly recommended that you upgrade to Windows 8, 7, or Vista.
When attempting to install software on Windows XP the end-user receives a message that reads:
"The Windows Installer Service could not be accessed. This can occur if you are running Windows in a safe mode, or if the Windows Installer is not correctly installed. Contact your support personnel for assistance."
To resolve the problem:
- Log into the computer as an administrator
- Click on Start
- Select Run
- In the "Open:" field, type cmd
- Click OK
An MS-DOS Prompt window will come up on the screen with a blinking cursor at the command line. In this window you will need to do the following:
- Type msiexec /unregister and press Enter
- Type msiexec /regserver and press Enter
After you have run the second command, it will return you to a new line ending with > and a blinking cursor. When you see this, you may safely close the command prompt, and try installing the software again.