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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".

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:

1. Click on Start.
2. Select Run.
3. In the "Open:" field, type: cmd.
4. 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:

1. Type msiexec /unregister and press Enter.
2. Type msiexec /regserver and press Enter.

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