Windows installer service error

I have downloaded the 64bit version of itunes for Windows 7 but when I try to run the install I get the following error:  "The Windows Installer Service could not be accessed.  This error can occur if you are running Windows in safe mode (which I am not) or if the Windows Installer is not correctly installed.  Contact you support personnel for assistance."  what can I do?!?

Question Info

Last updated December 19, 2017 Views 884 Applies to:

Hi Rebecca74,


1.      Check if Windows installer service is set to automatic. Steps to follow:

i.           Click Start and type services.msc in the search box

ii.         Search for the service Windows Installer

iii.       Right click on the service

iv.        If the service is stopped then Start the service

v.           To start the service right click on windows installer and select Properties

vi.        And in the Start-up type select Automatic

vii.      Now, try to install and check if that helps.


2.      Unregister Windows Installer, and then reregister Windows Installer. To do this, follow these steps:

i.              On the "Start" menu, click "Run”

ii.              In the "Open" box, type "msiexec /unreg", and then press ENTER.

iii.            On the "Start" menu, click "Run".

iv.            In the "Open" box, type "msiexec /regserver", and then press ENTER.


Link for reference:


3.      Make sure you have logged in as the administrator of the computer. Link for reference:


4.      I would even suggest you to uninstall iTunes completely. Check the below link to uninstall iTunes:

            And install iTunes from below link:


5.      If the above step does not resolve then you may need to contact apple support. Link:


Thanks and Regards:

Samhrutha G S - Microsoft Support.

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