Many a times while installing/updating software on the computers, people often complain of certain nagging issues. These software-related issues, springs up in almost all the popular operating systems. Similarly, the users of iTunes face many troubles while installing it on Windows.

Among the well-known issues, “The Windows Installer Service could not be accessed” is definitely one of the most common problems addressed today. Let’s discuss how to come out of this issue quickly.

The Windows Installer Service could not be accessed

Easily Fix “Windows Installer Service Could Not be Accessed” on Windows 10/8/7

1. Repair by Installing the Repair Driver in One Click hot

Whenever you had this error message when you install, update or even uninstall iTunes, the repair driver can help you get rid of “Windows installer service cannot be accessed”. To do it, you can take advantage of iMyFone TunesFix, an excellent iTunes repair tool. It’s specifically developed to repair all the iTunes errors and issues, including iTunes install/update/uninstall issues, iOS backup/restore/connect errors and 100+ more iTunes problems.

iMyfone TunesFix

1,000,000+ Downloads

Why Choose TunesFix iTunes Repair Tool?

  • Help in addressing the iTunes installation and update issues
  • Detect failed installation and complete the process automatically
  • Address and fix all the iTunes issues just in one click
  • iTunes data will be well protected when repairing
  • Completely uninstall the iTunes and associated software quickly

Windows version     

How to Repair the Windows Installer Service Error for iTunes

iMyFone TunesFix software has a multiversity trouble shooting scheme. These help the users to extract and repair all the possible installation and package related errors with ease. Let’s have look at the steps to repair installation.

If You Want to Install/Update iTunes

Step 1: Open iMyFone TunesFix application and it will detect the installation of iTunes automatically. In case, the iTunes is broken, then it will show the respective status. You can click “Back” icon to the home interface.

Step 2: Choose “Fix iTunes Install/Update Issues” and click on “Repair”. Then wait for it to finish.

iMyFone TunesFix screenshot

If you have this error when installing, now you can use iTunes as normal. If you have this error when updating, now you can go to iTunes and check for updates for it. It should work now.

If You Want to Uninstall iTunes

When you are in the home interface of iMyFone TunesFix, choose “Full Uninstall”. Click “Uninstall” and it will start to remove iTunes and its related software from your PC.

Note: If you don’t want to keep the iTunes data, check “Also delete user data...” before you click “Uninstall”.

iMyFone TunesFix screenshot

Other Key Features of iMyFone TunesFix:

  • It facilitates one-click process to delete iTunes, media files (music, movies, books, podcast, junk, cache, cookies, temporary files, logs, etc.
  • Perform deep cleaning by identifying and deleting the iTunes data created by the 3rd party software.
  • Solve the problems of abnormal behavior of iTunes and handles the unknown errors of iTunes.

2. Reset the Windows Installer Service Settings in the Registry (Risky)

Here we discuss the ways to reset the windows installer settings in the registry for your case when you get “windows installer service could not be accessed” issue.

There are a few important processes to follow and the first one would be of you to create a backup and reset the file using the key.

Step 1: In order to reset the Installer service settings, you would need to create a Registry file in the Notepad. Go to Start button and type Notepad in the search box.

Step 2: Paste the code given on the Notepad.

    Windows Registry Editor Version 5.00

    [HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesmsiserver] "DisplayName"="@%SystemRoot%\system32\msimsg.dll,-27"

    [HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesmsiserverEnum] "0"="Root\LEGACY_MSISERVER\0000"

Step 3: Then click on File and Save As. Name it “Msirepair.reg. Save this file on the Desktop. Close Notepad.

Step 4: On the desktop, right-click on Misrepair.reg file and click on Run as Administrator.

Step 5: When the prompt asks you to register the Keys, click on YES.
Now you can again start your installation process.

This way modifies the registry, which would cause serious problems if you don't make it correctly. So, pay more attention that you follow the steps very carefully. Besides, don't forget to back up the registry before you modify it.

3. By Using the CMD and MSIServer

Step 1: Click on the Start button and search for CMD in the PROGRAM dialog box.

Windows Installer

Step 2: Right click as you hover over the CMD and click on “Run as Administrator”.

Windows Installer

Step 3: After it runs, type net start MSIServer and press Enter.

4. Uninstall Any Earlier Versions of iTunes

Step 1: The process is to check if the program is already on the computer and then to delete or uninstall it from the source itself. So go to Start button and click on Control Panel.

Step 2: Click on Programs and Features.

Step 3: Type “Apple” in the search bar and enter. It will show you all the related Apple software installed on your PC.

Step 4: Right click on the software one by one (follow the order below) and click Uninstall.

  • iTunes
  • Apple Software Update
  • Apple Mobile Device Support
  • Bonjour
  • Apple Application Support 32-bit
  • Apple Application Support 64-bit


Please don’t uninstall them in a different order or just uninstall some. Or it will have unintended effects. To make sure you do it right, you can take advantage of iMyFone TunesFix’s “Full Uninstall” which helps you to remove all the iTunes related components from PC in the right place. If you doesn’t check, your iTunes data will be well-remained. When it’s done, you can click “click here” from the Done page to reinstall iTunes.

Windows version      Mac version