“I’m trying to update my iTunes to latest version 12.7. After downloading iTunes 12.7, I started the installation process but got the notification that “The Windows Installer Service could not be accessed. This can occur if the Windows Installer is not correctly installed. Contact your support personnel for assistance.” Please, what can I do to fix this error? – Mark”
How to Fix a Corrupted Windows 10 Installation. Kannon Yamada August 11, 2016 6 minutes. To Microsoft's credit, they now let us download and install fresh copies of Windows on our own, without needing a physical disk. But it still blows my mind that corruption issues can continue even after installing a fresh copy.
The complaint above describes what an iTunes user is going through, but our research on “The Windows Installer Service could not be accessed” error shows that many of us are still facing this challenge. We’ve discussed what happens when Windows Installer is not working, and some feasible solutions to this error in the following paragraphs.
What Happens When Windows Installer Not Working
When Windows Installer Service is not working, the following error message will be displayed:
The above error messages are most likely to be seen when installing, updating or uninstalling a program like iTunes.
1. Fix “Windows Installer Not Working” with TunesFix
You may have tried some methods but to no avail. If you don’t want to waste time, you can directly take advantage of iMyFone TunesFix. This software can fix all iTunes related Windows Installer Service errors and issues including “Windows Installer Service not working” when updating, installing or uninstalling iTunes software.
TunesFix has the features and capacity to improve your PC performance by getting rid of issues and errors that appear on Windows when you install or upgrade iTunes. It can also fix other iTunes issues, errors and problems.
TunesFix Repairs All the Issues Related to iTunes
Steps to Fix “Windows Installer Not Working” While Updating/Installing iTunes
Step 1: Download and install iMyFone TunesFix on your PC. Launch TunesFix and it will automatically detect your iTunes and its necessary components.
Step 2: Once it shows you the specific status of your iTunes, you can click on the “Repair” tab to fix the issue.
Step 3: When it’s done, you will find that the iTunes is successfully installed on your PC.
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2. Reset Windows Installer Service Settings in the Registry
Many iTunes/Windows users have recorded success in fixing Windows Installer Service could not be accessed on windows by resetting Microsoft Installer Service registry. However, this solution is a risky one because modifying your registry and results may lead to unexpected consequences.
Step 1: Open your Windows search box next to your Start Menu, and search for “Notepad”. Click on “Notepad” under “Best match” results.
Step 2: Copy and paste the following codes into the notepad document file you just opened:
Free Repair Windows Installer
Windows Registry Editor Version 5.00[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesmsiserver]'DisplayName'='@%SystemRoot%system32msimsg.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%system32msimsg.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_MACHINESYSTEMCurrentControlSetServicesmsiserverEnum]'0'='RootLEGACY_MSISERVER0000' 'Count'=dword:00000001 'NextInstance'=dword:00000001
Step 3: Click on “File”, select “Save As”, and select a location to save the file. Name the file as Misirepair.reg. Select “All Files” under “Save as type” then click “Save”.
Repair Windows Installer Windows 10 Free
Step 4: Go to the location where you saved the file and right-click on it, then select “Run as Administrator”. If you’re prompted to confirm your action, just do so.
After resetting Windows Installer Service registry, try and update/install iTunes again.
3. Start the Windows Installer Service
Manually starting Windows Installer Service can be a good solution to its errors. To manually start Windows installer service, just follow these steps:
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Step 1: Click Start and type CMD in the search bar.
Step 2: Find cmd.exe and right click on it. Choose Run as Administrator.
Step 3: Enter net start MSIServer and press Enter.
You have succeeded in starting Windows Installer Service manually.
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RECOMMENDED: Click here to fix Windows errors and improve PC performance
Are you experiencing issues on your Windows 10 PC? Want to repair the Windows 10 installation but don’t want to lose apps and data? Here is how to repair Windows 10 install without losing programs and files.
Automatic Repair Microsoft Windows 10
Windows 10 Settings offers you to reset Windows 10 install by keeping personal files. However, in the process, it removes your installed apps, including classic desktop programs.
If you have tens of programs installed on your Windows 10 PC and tons of data, there is no point in resetting your Windows 10 as it doesn’t offer an option to keep installed apps.
If you are experiencing issues on your Windows 10 PC and want to repair the installation to fix all issues without losing installed programs and data, use this guide to repair Windows 10 installation without losing data and apps.
To proceed with this guide, you will need either Windows 10 ISO, bootable USB of Windows 10 or Windows 10 bootable DVD.
IMPORTANT: As pointed out, this method will preserve your apps and data. However, we recommend you backup all data to a safe place just in case if something goes terribly wrong during the repair.
Repair Windows 10 installation without losing data and apps
Step 1: Skip this step if you have the ISO image or bootable media of Windows 10. Else, download the latest version of Windows 10 from Microsoft using Windows 10 Media Creation Tool. You can refer to our download Windows 10 from Microsoft guide for step-by-step directions.
Remember that you don’t need to download the Windows 10 ISO if you have bootable DVD or bootable USB of Windows 10. It’s important to note that the ISO or bootable media must be the same version of Windows 10 that you currently installed on your PC.
Repair Install Windows 10 From Usb
Step 2: Navigate to the folder containing the ISO image, right-click on the ISO and then click Mount option to mount the ISO image. Open This PC to see a new drive. Right-click on the new drive in This PC and then click Open in new window option to open it.
If you have the bootable USB or bootable DVD of Windows 10, connect them to your PC, right-click on the USB drive in This PC, and then click Open in new window option to open the bootable USB or DVD.
Step 3: In the root folder of ISO/DVD/USB, you will see Setup (.exe) file. Double-click on the Setup file to launch the Windows 10 setup.
Click Yes button if you see the User Account Control screen.
Step 4: You will get “Get important updates” screen. Select Not right now option and then check or uncheck I want to help make the installation of Windows better option.
Click Next button. You will see “We are getting a few things ready” screen for a few seconds.
Step 5: Next, you will get the license agreement screen. Agree to the license agreement by selecting “I accept the license terms” checkbox and then clicking the Next button. The setup will now check if your PC has enough space and meets minimum system requirements.
Step 6: In a few minutes, you will get the “Ready to install” screen. This is the most important step of the procedure. At this screen, make sure that Install Windows 10 Home/Pro and Keep personal files and apps options are selected. If not, click Change what to keep link, and then select Keep personal files and apps option repair your Windows 10 install without losing your data and installed apps.
Finally, click Install button to begin repairing your Windows 10 installation. It might take up to an hour to complete the repair or install.
Windows Installer Repair Tool Windows 10
Once done, you will see the lock screen of Windows 10. Press Enter key and then type your user account password. Windows 10 will display the sign-in animation for a few seconds before taking you to the desktop.
That’s it! You have successfully repaired the Windows 10 installation without losing apps and data.
You might also like to know how to easily backup data from unbootable PC guide.
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