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Windows Installer Editor's Review
Make the installation, maintenance and un-installation of your software easy with Windows Installer.
So it's still the good old program that provides a base on which software developers can make the installation, updating and un-installation of their products quick, easy and familiar for the user.
A nice addition for software developers is the ability to integrate a customer user interface handler in the installer package: personalise the product experience for your customers.
As for those customers, there's some good news for you as well. No more installing each package individually and rebooting your computer for every single one! Imagine the time you'll save. With Windows Installer 4.5 the process has integrated so the installation progress, rollback and reboot happens in one single action that makes the installation process simple and less time consuming.
Other updates of interest include the update supersedence resiliency, shared component patching resiliency during uninstall and custom action execution on update uninstall. As a result of these changes certain issues experienced whilst using earlier version of Windows Installer have been resolved, including a rather annoying glitch that even if a component of an update was shared by various products, that component would still be removed if the update was uninstalled.
Pro's: Integrated installation, rollback and reboot
Con's: None that we can see.. reliable and easy to use.
Conclusion: Windows provide some of the most reliable software out on the market and this is no different. We highly recommend updating if you're running on a Windows OS.
When you install an application, you may receive the prompt saying 'The Windows Installer Service could not be accessed'. Under this condition, you cannot continue installing the program unless you fix the error. Give that, here we will show you all the possible ways to fix the 'Windows Installer service could not be accessed' issue.
Windows Installer Service Could Not Be Accessed
'I recently upgraded to Windows 10 from Windows 8. Now, every time I try to download a new program, it keeps telling me the Windows Installer Service could not be accessed. The same thing happens when I try to uninstall a program. I have no clue how to 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 to complete the installation or uninstallation process.
Moreover, you need to fix it or you will encounter the very same issue the next time you install/uninstall an application.
Here's quick 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 Solutions | Step-by-step Troubleshooting |
---|---|
Fix 1. Start Windows Installer Service | Type cmd in Windows Search box and right-click on Command Prompt, select 'Run as administrator'..Full steps |
Fix 2. Uninstall Older Version of Software/Program | We advise you to remove or uninstall the old version from your PC in advance..Full steps |
Fix 3. Install the Latest Version of Windows Installer | Open Command Prompt and type the cmd..Full steps |
Fix 4. Reinstall Windows Installer | Type regedit in search and hit Enter. Click 'yes' to open Registry..Full steps |
Fix 5. Re-Register Microsoft Installer Service | Press 'Windows + R' keys. Type cmd and hit 'Enter'..Full steps |
Fix 6. Use regsvr32 Command | Type cmd in Windows Search, right-click on Command Prompt and select 'Run as administrator'..Full steps |
Fix 7. Delete Duplicated MISEXEC File | Open Windows File Explorer and go to C:WindowsSystem32..Full steps |
Fix 8. Change Remove Procedure Call Services Settings | Type service in Windows Search and click Search from the list..Full steps |
Fix 9. Run SFC and DISM Command | Type cmd in Windows Search, right-click on Command Prompt and select 'Run as Administrator'..Full steps |
The provided methods can be applied to help you effectively fix the same issues on Windows 10/8/7, etc. Check out how to make Windows installer work again so as to 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, and 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 and 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 to help you get rid of Windows installer service error immediately:
Note that 1-3 are quick fixes that you can follow to make Windows Installer Service work normally again quickly. If none of the 3 quick 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 Command Prompt and the other one is to manually start it.
Check out the steps to start the Windows Installer.
Use Command Prompt
Step 1. Type cmd in Windows Search box and right-click on Command Prompt, select 'Run as administrator'.
Step 2. Enter netstart MSIServer and hit Enter.
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Manually Start Windows Installer using Service Settings
Step 1. Type services in Windows Search and 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 to Install
If the Windows installer is not working when you plan to install a new version of software or program, you can remove the earlier version of the software or program.
We advise you to 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 Latest 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 to help you out, which is to install the latest version of Windows Installer. To do so, you can either try CMD command or manually install it on your own.
Install Windows Installer via CMD Command:
Step 1. Press 'Windows + R' keys. Type cmd and hit 'Enter'.
Step 2. At the Command Prompt, type the following lines and press 'Enter' after you type each line.
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Step 3. At the command prompt, type exit, and then press 'Enter'.
Step 4. Restart your computer.
Step 5. Update the Windows Installer files to the latest version.
To do so, visit the Microsoft Web sites, and then download and 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 and Install the Latest Version of Windows Installer
Step 1. Manually Download Windows Installer from Microsoft.
Step 2. After downloading, double-click the file to start the installation.
Step 3. Follow the onscreen instruction to complete the installation process.
Fix 4. Reset Windows Installer Service Registry
Note that editing Registry may cause some of your apps to malfunction. Please be very careful while you are resetting Windows Installer via Registry.
Back Up Registry First
Step 1. Type regedit in search and hit Enter. Click 'yes' to open Registry.
Step 2. On the Registry window, go to File and click 'Export'.
Step 3. Select 'All' as the Export range, name the Registry backup, then click 'Save' to export.
After this, close Registry Editor.
Create a .reg File and Add to Registry
Step 1. Open Notepad or create a new text document.
Step 2. Paste the following text into the Notepad:
Step 3. Name the notepad as repair with a file extension - .reg. In other words, you need to save the Notepad as repair.reg.
Step 4. Right-click the repair.reg file and select 'Run as administrator'.
Step 5. If you are requested for administrator account and password, type the password and click 'Continue'.
Windows Installer Error 501
Step 6. If it prompts to install the registry keys, click 'Yes'.
After this, you can continue with the installation process for the programs and 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 solve the Windows Installer Service could not be accessed error.
Step 1. Press 'Windows + R' keys. Type cmd and hit 'Enter'.
Step 2. In Command Prompt, type the following lines. You need to hit 'Enter' every time after each line.
If you are using 32-bit Windows, enter the commands below one by one instead.
Step 3. Close Command Prompt by entering 'exit' and then restart your computer.
Now you have re-registered the Windows Installer Service. Check and see if you fix the Service could not be accessed error.
Fix 6. Use regsvr32 Command
Step 1. Type cmd in Windows Search, right-click on Command Prompt and select 'Run as administrator'.
Step 2. Type regsvr32 c:windowssystem32msi and hit Enter.
Wait for the command to run and close Command Prompt when the process completes.
Fix 7. Delete Duplicated MISEXEC File
Step 1. Open Windows File Explorer and go to C:WindowsSystem32.
Step 2. Look for msiexec.exe.
Step 3. If there is another msiexec file with no file extension or a 0KB file, delete it or rename it to msiexec.old.
Step 4. Go to Fix 1 to manually start the Windows Installer.
Fix 8. Change Remove Procedure Call Services Settings
Step 1. Type service in Windows Search and click Search from the list.
Step 2. On Service window, locate and double-click on Remove Procedure Call (RPC) service.
Step 3. Go to the Log on tab, select 'Log on as Local System Account' and check 'Allow this service to interact with the desktop'.
Windows Installer Error 5 Access Denied
Step 4. Save changes and restart your PC.
Fix 9. Run SFC and DISM Command
Step 1. Type cmd in Windows Search, right-click on Command Prompt and select 'Run as Administrator'.
Step 2. Type the following command and hit Enter each time:
Step 3. Wait for the process to complete and type exit to close Command Prompt window.
After this, restart your PC to keep all the changes. You shall be able to use Windows Installer on your PC again.
Extra Tip: Recover Data After You Have Fixed the Error
Windows Installer Error 5.1
Any of the methods above may cause data loss. If you have data loss problem after you have fixed the Windows installer service error, we can help.
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Reliable hard drive recovery software - EaseUS Data Recovery Wizard can help fix this problem. It's fully compatible with Windows 10/8.1/8/7 and older Windows versions. You can download it for free and follow the steps to restore lost data from Windows 10/8/7 now.
Step 1. Select a location and start scanning.
Launch EaseUS Data Recovery Wizard, hover on the partition where you lost data, then click 'Scan'.
Step 2. Preview and select the files.
Wait until the scanning completes. If you need to double-click the item to preview the file, then select the data you attempt to recover.
Step 3. Recover lost data.
Click 'Recover', choose a location to save the recovered data, then click 'OK'. You should store the data in another place instead of the original one.
Conclusion
On this page, we explained why Windows Installer Service suddenly not work and covered 9 fixes to help you fix this error, making Windows Installer service back to work again.
Note that if you've recently installed a new version of Windows OS, remember to 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 EaseUS Data Recovery Wizard help.