The Windows Installer Service Could Not Be Accessed with iTunes

Software-related problems are miserable to deal with. Figuring out whether the problem is with the software or if it’s with your computer can be time-consuming and very difficult. In this case, we’re referring to the Windows installer service could not be accessed error. This error sometimes appears when users are trying to install or update iTunes, but the reason for this is unknown.

In recent months we have seen an increase in people wondering how to fix this. As such, we’ve put together a short guide that you can follow to fix it as quickly as possible.

PS: also, you can find out the best solutions for Desktop Window Manager High CPU error.

Part 1. Best iTunes Repair Tool – Tenorshare TunesCare

When it comes to fixing iTunes, there isn’t a better program to use than Tenorshare TunesCare. Any error messages, driver problems, or update problems can all be fixed with this repair tool. It’s also worth noting that this program is specifically for fixing iTunes-related problems. As such, you can be sure that this will fix the Windows installer service that could not be accessed.

  • Fix absolutely any iTunes problems that you encounter, like iTunes error 7.
  • You don’t delete personal data when repairing iTunes installation.
  • Resume and repair faulty iTunes install process.
  • Try before you buy with the trial version of Tenorshare TunesCare.
  • Repair all unknown iTunes errors without the need to search for online fixes.

There are a lot of helpful features on Tenorshare TunesCare so even if you don’t have the installation error, it’s still worth checking out. For the two following guides, you have to download and install Tenorshare TunesCare before you follow the steps and so go ahead and do this now.

Fix The Windows Installer Service Could Not Be Accessed Issues with Installing or Updating

We will first look at how you can deal with issues that prevent you from installing or updating your iTunes. These problems can occur for a range of different reasons but regardless of what causes it, here is how you can fix it.

#1 – First, download and launch Tenorshare TunesCare on your PC.

#2 – Then please connect your device to your PC, and tap on “Fix All iTunes Issues” mode to continue.

Tenorshare TunesCare

#3 – Now, Tenorshare TunesCare starts to download the required repairing drives for iTunes repairing, after that, it will repair your iTunes automatically. Once the repair task is finished, your iTunes will restart automatically.

This will fix any problems that you have with installing or updating iTunes in no time at all. Please note that this process is safe and most of all it won’t affect your personal data.

Part 2. Fix The Windows Installer Service Could Not Be Accessed with Registry Reset

If you know a lot about computers, then you can try this more complex approach. For this solution, we’re going to be looking at the computer’s registry. Doing this is very risky and could cause severe problems with your computer, so take a registry backup prior to following these steps.

#1 – We first must create a registry file. To do this, open the “Notepad” program and copy the snippet of code from below into the document.

#2 – Click the “File” tab and select “Save As“. Save this file as “Msirepair.reg” in an easily accessible location.

#3 – Go to the file’s location, right-click on it, and click “Run as Administrator“.

#4 – A Windows Security prompt will appear. Press “Yes” and then attempt to reinstall iTunes.

There are some disadvantages to resetting your computer’s registry. Aside from the fact that a single wrong move could cause your computer to malfunction, it’s also a difficult method.

Also, let’s figure out how to fix the issues like iTunes not opening with ease.

Registry Code

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\msiserver] “DisplayName”=”@%SystemRoot%\\system32\\msimsg.dll,-27”
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\msiserver\Enum] “0”=”Root\\LEGACY_MSISERVER\\0000″

Part 3. Use Command Prompt and MSIServer

Another possible fix is to run the MSIServer command that in comparison to the previous method, is much safer.

#1 – Search for “Command Prompt” in the search bar, right-click on the program, and click “Run as administrator“.

Use Command Prompt and MSIServer to fix The Windows Installer Service Could Not Be Accessed

#2 – Once it’s opened, type “net start MSIServer” and hit the “Enter” key afterward.

#3 – Attempt to install iTunes again.

This is a fairly straightforward and stress-free solution to fix the Windows installer service could not be accessed although sometimes it will work and other times it won’t.

Part 4. Manually Remove iTunes Components

If none of the solutions so far have dealt with your problem, then try taking the manual approach and manually uninstall the iTunes components. This can be a bit tedious, but it can often prove to be very useful.

#1 – Enter “Control Panel” in the search bar and from the panel, select “Programs and Features“.

#2 – At the top-right of the window, click the search box and enter “Apple“. This will make the list of programs only show Apple software.

#3 – You must install each iTunes component in a specific order, which is as follows:

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

#4 – Select the program and click “Uninstall” at the top of the window.
In some cases, the error will persist until you fully uninstall iTunes, but by manually uninstalling the relevant software you can make sure that you fix iTunes properly.

To Conclude for the Windows Installer Service Could Not Be Accessed

To conclude, as frustrating as it is this problem is actually one of the easiest to fix. Fixing the Windows installer service could not be accessed error takes absolutely no time at all. We suggest that you try Tenorshare TunesCare first. This program is reliable and takes care of everything for you – there are no risks with using it. In comparison, changing your computer’s registry can end drastically. All in all, we hope that one of these solutions helps you to fix your iTunes software.


Excellent software expert specializing in software & application testings, making comparisons, researching, and loves blogging, writing reviews, video tutorials, and the like.