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Windows Installer error message on Windows XP

(Added: August 04, 2006 )






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 		• When you attempt to install a program that uses Windows Installer (i.e. Microsoft Office), you may encounter the error message: "The Windows Installer service could not be accessed. This can occur if you are running in safe mode or if the Windows Installer is not correctly installed."

Reason which causes the error messages:

- If you are not running in safe mode, this error is probably (90% of the times) the result of a damaged registration service.

SOLUTION:
  1. Open Command Prompt from Start > Run and type "cmd" (without quotes), then press Enter.

  2. When the Command Prompt will open:

    • Type:

      msiexec /unregister

      and press Enter (caution to type exactly: msiexec[keyboard space]/unregister - it will be some disk activity but No confirmation message will appear).

    • When the cursor start blinking again, type:

      msiexec /regserver

      and press Enter (caution to type exactly: msiexec[keyboard space]/regserver - it will be some disk activity again but No confirmation message will appear either).

    • When the cursor start blinking again, type: "Exit" (without quotes) and press Enter to Finish.