How to resolve Windows Installer Service could not be Accessed Error Message

Sometimes whenever you try to install some programs or software, it displays an error message saying ‘The Windows Installer Service could not be accessed’. This makes it difficult to proceed with the installation process. To get help for this matter call directly at the Microsoft Support Number or you also apply the steps mentioned below:

1. Uninstall the earlier version of the software you want to install
If the Windows installer is not working, you can try removing the previous version of the software you want to install before you install the latest one. Installing software without removing the older version can sometimes create issues while using the Windows installer service.

2. Check if the installer service is running

• From the start menu, search for Run option.
• In the dialog box shown to you, type msconfig, and then click Ok. 
• Now, on the Services tab, click to select the checkbox that is next to the Windows Installer.â
• Press ok and then click on ‘Restart’ to restart the computer. 

3. Re-register Microsoft installer service
If the Windows installer service isn't running then you can Re-register the installer service as Re-registering Microsoft Installer Service method can help you to solve the Windows Installer Service could not be accessed error. To re-register the Microsoft installer service, follow the given steps:

1. Press Win + R keys and type “cmd” and then press enter.
2. In the Command Prompt box, type the following lines and press enter every time after each line.
     %windir%\system32\msiexec.exe /unregister
      %windir%\system32\msiexec.exe /regserver
      %windir%\syswow64\msiexec.exe /unregister
      %windir%\syswow64\msiexec.exe /regserver
    
3. Then close the Command Prompt and restart your system.
4. This will re-register the Windows Installer Service and check and see if the Service could not be accessed error has fixed. 

4. Reinstall Windows installer
If none of the methods work for you then you can try reinstalling the Windows installer.

• From the start menu search for CMD.
•  At the command prompt box, type the given lines and press enter after typing each line.
   
    cd %windir%\system32
    ren msi.dll msi.old
    ren msiexec.exe msiexec.old
    ren msihnd.dll msihnd.old
   
• In the command prompt box, type exit and then press ‘Enter’.
• Restart your computer and update the Windows Installer files to its latest version. You can do so by visiting the Microsoft Web sites and from there download and install Windows Installer.
• When the installation of the Windows Installer is complete, you can restart your computer normally before starting installing the programs.

If still there is any confusion don’t forget to call at the Microsoft Support Phone Number.