Windows Installer Service Could Not Be Accessed

"I recently upgraded to lớn Windows 10 from Windows 8. Now, every time I try lớn tải về a new program, it keeps telling me the Windows Installer Service could not be accessed. The same thing happens when I try lớn uninstall a program. I have no clue how to lớn fix this, and it is really hindering me. I can"t install anything! Please help me. Thanks!"

If you see this notification - "The Windows Installer Service could not be accessed" while trying to install or uninstall a program, you won"t be able khổng lồ complete the installation or uninstallation process.

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Moreover, you need khổng lồ fix it or you will encounter the very same issue the next time you install/uninstall an application. 

Here"s quiông chồng navigation for troubleshooting the Windows installer service could not be accessed problem. Try the given methods one by one to fix Windows installer on your computer alright:

Workable SolutionsStep-by-step Troubleshooting
Fix 1. Start Windows Installer ServiceType cmd in Windows Search box và right-cliông xã on Commvà Prompt, select "Run as administrator"...Full steps
Fix 2. Uninstall Older Version of Software/ProgramWe advise you to remove sầu or uninstall the old version from your PC in advance...Full steps
Fix 3. Install the Lakiểm tra Version of Windows Installerxuất hiện Commvà Prompt và type the cmd...Full steps
Fix 4. Reinstall Windows InstallerType regedit in tìm kiếm & hit Enter. Clichồng "yes" khổng lồ open Registry...Full steps
Fix 5. Re-Register Microsoft Installer ServicePress "Windows + R" keys. Type cmd & hit "Enter"...Full steps
Other 4 FixesMove khổng lồ get more fixes...Full steps

The provided methods can be applied to lớn help you effectively fix the same issues on Windows 10/8/7, etc. Cheông chồng out how to lớn make Windows installer work again so as khổng lồ install new software on your PC.

Causes of Windows Installer Not Working

Windows Installer is a Microsoft Windows component that is used for software installation, maintenance, & removal. So how to fix "Windows Installer Service could be not accessed" or resolve Windows installer is not working issue? 

Here are the main causes of this error và you figure out a better solution toward this issue:

Windows Installer is not correctly installed.Windows Installer files are damaged or missing.Registry permissions or .Windows Installer is outdated or has a compatible issue.

Don"t worry if you are having this issue on your computer. Try the provided methods in the next part, you"ll make Windows Installer work properly again in Windows 10/8/7.

9 Fixes for Windows Installer Service Could Not Be Accessed Error 

Considering the causes, we collected 9 practical fixes here lớn help you get rid of Windows installer service error immediately:

cảnh báo that 1-3 are quiông chồng fixes that you can follow to make Windows Installer Service work normally again quickly. If none of the 3 quiông chồng fixes work, you may try 4-9 fixes one by one.

Fix 1. Manually Start Windows Installer Service

There are two accesses that you can use to manually start Windows Installer. One is using Comm& Prompt and the other one is lớn manually start it. 

Cheông xã out the steps lớn start the Windows Installer.

Use Comm& Prompt

Step 1. Type cmd in Windows Search box and right-clichồng on Command Prompt, select "Run as administrator".

Step 2. Enter netstart MSIServer và hit Enter. 


Manually Start Windows Installer using Service Settings

Step 1. Type services in Windows Search & select "Services" from the result.

Step 2. On the Service window, locate Windows Installer and check its state.

Step 3. If it"s not running, right-click on Windows Installer and select "Start".


Fix 2. Uninstall Older Version of Software/Program You Want khổng lồ Install

If the Windows installer is not working when you plan to install a new version of software or program, you can remove sầu the earlier version of the software or program.

We advise you lớn remove or uninstall the old version from your PC in advance. Installing software without removing the older version can sometimes cause unexpected issues.

Fix 3. Install the Lakiểm tra Version of Windows Installer

If Windows installer is outdated or not compatible with your current Windows OS, it may not work properly and you may receive the "Windows Installer Service could not be accessed" error.

So here is another practical way lớn help you out, which is to install the latest version of Windows Installer. To do so, you can either try CMD commvà or manually install it on your own.

Install Windows Installer via CMD Command:

Step 1. Press "Windows + R" keys. Type cmd & hit "Enter".

Step 2. At the Command Prompt, type the following lines and press "Enter" after you type each line.

Step 3. At the commvà prompt, type exit, and then press "Enter".

Step 4. Restart your computer.

Step 5. Update the Windows Installer files to lớn the lakiểm tra version.

To bởi so, visit the Microsoft Web sites, & then download và install Windows Installer. After the installation of the Windows Installer is complete, shut down and restart your computer normally before you install programs.

Manually Download & Install the Lademo Version of Windows Installer

Step 1. Manually Download Windows Installer from Microsoft.

Step 2. After downloading, double-click the file khổng lồ start the installation.

Step 3. Follow the onscreen instruction to complete the installation process. 

Fix 4. Remix Windows Installer Service Registry

Note that editing Registry may cause some of your apps to lớn malfunction. Please be very careful while you are resetting Windows Installer via Registry.

#1. Baông xã Up Registry First

Step 1. Type regedit in search and hit Enter. Clichồng "yes" to open Registry.

Step 2. On the Registry window, go khổng lồ File và cliông chồng "Export".


Step 3. Select "All" as the Export range, name the Registry backup, then cliông xã "Save" to export.


After this, cthua thảm Registry Editor. 

#2. Create a .reg File and Add lớn Registry

Step 1. Open Notepad or create a new text document. 

Step 2. Copy all the text from the Microsoft support page (Method 1 Step 3) to lớn a Notepad. 

Step 3.

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Name the notepad as repair with a file extension - .reg. In other words, you need to lớn save sầu the Notepad as repair.reg.

Step 4. Right-click the repair.reg tệp tin và select "Run as administrator". 

Step 5. If you are requested for administrator trương mục & password, type the password and cliông xã "Continue".

Step 6. If it prompts to lớn install the registry keys, clichồng "Yes". 

After this, you can continue with the installation process for the programs và software on your PC.

Fix 5. Re-Register Microsoft Installer Service

If you find the Windows installer service isn"t running, you can re-register the installer service. Re-registering Microsoft Installer Service is another good method to lớn solve the Windows Installer Service could not be accessed error.

Step 1. Press "Windows + R" keys. Type cmd và hit "Enter".

Step 2. In Comm& Prompt, type the following lines. You need to hit "Enter" every time after each line.

%windir%system32msiexec.exe cộ /unregister%windir%system32msiexec.exe pháo /regserver%windir%syswow64msiexec.exe /unregister%windir%syswow64msiexec.exe cộ /regserver

If you are using 32-bit Windows, enter the commands below one by one instead.

msiexec /unregistermsiexec /regserver

Step 3. Cthua thảm Command Prompt by entering "exit" and then restart your computer.

Now you have sầu re-registered the Windows Installer Service. Chechồng & see if you fix the Service could not be accessed error.

Fix 6. Use regsvr32 Command

Step 1. Type cmd in Windows Search, right-cliông xã on Command Prompt and select "Run as administrator".

Step 2. Type regsvr32 c:windowssystem32msi và hit Enter.

Wait for the commvà khổng lồ run và cthất bại Command Prompt when the process completes.

Fix 7. Delete Duplicated MISEXEC File

Step 1. mở cửa Windows File Explorer and go to C:WindowsSystem32.

Step 2. Look for msiexec.exe.

Step 3. If there is another msiexec tệp tin with no tệp tin extension or a 0KB file, delete it or rename it to msiexec.old.

Step 4. Go lớn Fix 1 lớn manually start the Windows Installer.

Fix 8. Change Remove sầu Procedure điện thoại tư vấn Services Settings

Step 1. Type service in Windows Search & cliông chồng Search from the danh sách.

Step 2. On the Service window, locate and double-click on Remove Procedure Điện thoại tư vấn (RPC) service.

Step 3. Go to lớn the Log On tab, select "Log on as Local System Account" và kiểm tra "Allow this service to lớn interact with the desktop".


Step 4. Save sầu changes and restart your PC.

Fix 9. Run SFC and DISM Command

Step 1. Type cmd in Windows Search, right-clichồng on Commvà Prompt và select "Run as Administrator".

Step 2. Type the following comm& & hit Enter each time:

sfc /scannowDISM /Online /Cleanup-Image /RestoreHealth

Step 3. Wait for the process to complete và type exit lớn cthất bại Command Prompt window.

After this, restart your PC lớn keep all the changes. You shall be able to lớn use Windows Installer on your PC again.

Extra Tip: Recover Data After You Have Fixed the Error

Any of the methods above sầu may cause data loss. If you have data loss problem after you have sầu fixed the Windows installer service error, we can help.

Reliable hard drive sầu recovery software - Data Recovery Wizard can help fix this problem. It"s fully compatible with Windows 10/8.1/8/7 & older Windows versions. You can tải về it for free & follow the steps to restore lost data from Windows 10/8/7 now.

Step 1. Choose the location where data loss happened, be it a hard disk drive sầu, external disk, USB, or SD card, then cliông chồng "Scan".


Step 2. You can click Filter khổng lồ display only the tệp tin types you want while scanning. Go to lớn "Deleted Files" or "Other Lost Files", find the files you want.


Step 3. After choosing the data, cliông chồng "Recover" and choose a location on another drive to lớn save sầu the files.



On this page, we explained why Windows Installer Service suddenly not work và covered 9 fixes to help you fix this error, making Windows Installer service back to lớn work again.

cảnh báo that if you"ve recently installed a new version of Windows OS, remember khổng lồ update or install the latest version of Windows Installer too. Usually, it would automatically update with the Windows OS.

If you lost files after fixing the "Windows Installer Service cannot be accessed error", don"t worry and you can let Data Recovery Wizard help.