Troubleshooting “The Windows Installer Service Could Not Be Accessed” with iTunes

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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.

Part 1. Best iTunes Repair Tool – iMyFone TunesFix

When it comes to fixing iTunes, there isn't a better program to use than iMyFone TunesFix. 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 could not be accessed.

  • Fix absolutely any iTunes problems that you encounter, like iTunes could not connect to this iPhone, iTunes error 7iTunes not openingiTunes Won't Open on Windows 10.
  • Uninstall all of iTunes' components with a single click.
  • 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 iMyFone TunesFix.
  • Clean-up iTunes files including old updates and temporary files.
  • Repair all unknown iTunes errors without the need to search for online fixes.
  • Deep clean iTunes to remove every single unnecessary file, including backups.

Download iMyfone TunesFix (Windows Version)

There are a lot of helpful features on TunesFix 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 iMyFone TunesFix before you follow the steps and so go ahead and do this now.

Fix 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.

Step #1 – Launch iMyFone TunesFix and wait for the short iTunes scan to complete.

Step #2 – When the scan is over, click on the back icon to navigate to the main menu.

Step #3 – From here, choose “Fix iTunes Install/Update Issues” and then click “Repair“.


Step #4 – After a few moments the repairs will be complete.

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.

Completely Uninstall All iTunes Software

If iTunes is proving to be too much of a hassle, you might decide to uninstall it. Alternatively, you could try completely uninstalling iTunes in order to fix the Windows installer service could not be accessed.

Step #1 – Open iMyFone TunesFix and let the iTunes scan conclude.

Step #2 – Click the back icon which will take you to the main menu.

Step #3 – A list of features will appear; select “Full Uninstall” from this display.


Step #4 – Click on “Uninstall” and wait a few minutes while all of the components are uninstalling. If you want all of your personal data to be removed, check the box “Also delete user data: iTunes media, backups, updates, junk files, etc.”.


After you uninstall iTunes and all of its components with iMyFone TunesFix, there won't be any files left behind and you can either install an iTunes alternative or just reinstall a fresh iTunes installation.

Download iMyfone TunesFix (Windows Version)

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.

Step #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.

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

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

Step #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.

Registry Code

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\msiserver] “DisplayName”=”@%SystemRoot%\\system32\\msimsg.dll,-27”
“ImagePath”=hex(2):25,00,73,00,79,00,73,00,74,00,65,00,6d,00,72,00,6f,00,6f,00,\
74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,6d,\
00,73,00,69,00,65,00,78,00,65,00,63,00,20,00,2f,00,56,00,00,00
“Description”=”@%SystemRoot%\\system32\\msimsg.dll,-32”
“ObjectName”=”LocalSystem”
“ErrorControl”=dword:00000001
“Start”=dword:00000003
“Type”=dword:00000010
“DependOnService”=hex(7):72,00,70,00,63,00,73,00,73,00,00,00,00,00
“ServiceSidType”=dword:00000001
“RequiredPrivileges”=hex(7):53,00,65,00,54,00,63,00,62,00,50,00,72,00,69,00,76,\
00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,43,00,72,00,65,00,61,00,\
74,00,65,00,50,00,61,00,67,00,65,00,66,00,69,00,6c,00,65,00,50,00,72,00,69,\
00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,4c,00,6f,00,63,00,\
6b,00,4d,00,65,00,6d,00,6f,00,72,00,79,00,50,00,72,00,69,00,76,00,69,00,6c,\
00,65,00,67,00,65,00,00,00,53,00,65,00,49,00,6e,00,63,00,72,00,65,00,61,00,\
73,00,65,00,42,00,61,00,73,00,65,00,50,00,72,00,69,00,6f,00,72,00,69,00,74,\
00,79,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,\
65,00,43,00,72,00,65,00,61,00,74,00,65,00,50,00,65,00,72,00,6d,00,61,00,6e,\
00,65,00,6e,00,74,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,\
00,00,53,00,65,00,41,00,75,00,64,00,69,00,74,00,50,00,72,00,69,00,76,00,69,\
00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,53,00,65,00,63,00,75,00,72,00,\
69,00,74,00,79,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,\
00,53,00,65,00,43,00,68,00,61,00,6e,00,67,00,65,00,4e,00,6f,00,74,00,69,00,\
66,00,79,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,\
00,65,00,50,00,72,00,6f,00,66,00,69,00,6c,00,65,00,53,00,69,00,6e,00,67,00,\
6c,00,65,00,50,00,72,00,6f,00,63,00,65,00,73,00,73,00,50,00,72,00,69,00,76,\
00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,49,00,6d,00,70,00,65,00,\
72,00,73,00,6f,00,6e,00,61,00,74,00,65,00,50,00,72,00,69,00,76,00,69,00,6c,\
00,65,00,67,00,65,00,00,00,53,00,65,00,43,00,72,00,65,00,61,00,74,00,65,00,\
47,00,6c,00,6f,00,62,00,61,00,6c,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,\
00,67,00,65,00,00,00,53,00,65,00,41,00,73,00,73,00,69,00,67,00,6e,00,50,00,\
72,00,69,00,6d,00,61,00,72,00,79,00,54,00,6f,00,6b,00,65,00,6e,00,50,00,72,\
00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,52,00,65,00,\
73,00,74,00,6f,00,72,00,65,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,\
00,65,00,00,00,53,00,65,00,49,00,6e,00,63,00,72,00,65,00,61,00,73,00,65,00,\
51,00,75,00,6f,00,74,00,61,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,\
00,65,00,00,00,53,00,65,00,53,00,68,00,75,00,74,00,64,00,6f,00,77,00,6e,00,\
50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,54,\
00,61,00,6b,00,65,00,4f,00,77,00,6e,00,65,00,72,00,73,00,68,00,69,00,70,00,\
50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,4c,\
00,6f,00,61,00,64,00,44,00,72,00,69,00,76,00,65,00,72,00,50,00,72,00,69,00,\
76,00,69,00,6c,00,65,00,67,00,65,00,00,00,00,00
“FailureActions”=hex:84,03,00,00,00,00,00,00,00,00,00,00,03,00,00,00,14,00,00,\
00,01,00,00,00,c0,d4,01,00,01,00,00,00,e0,93,04,00,00,00,00,00,00,00,00,00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\msiserver\Enum] “0”=”Root\\LEGACY_MSISERVER\\0000″
“Count”=dword:00000001
“NextInstance”=dword:00000001

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.

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

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

Step #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.

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

Step #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.

Step #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

Step #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 iMyFone TunesFix at 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 help you to fix your iTunes software.

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