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Error “The Windows Installer Service Could Not Be Accessed” when installing or updating programs on Windows 7 or Windows Vista

Error “The Windows Installer Service Could Not Be Accessed” when installing or updating programs on Windows 7 or Windows Vista

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KB Article:


When attempting to install applications you may receive the following error:

"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."

For this issue on Windows XP or Windows Server 2003 see the following article:

315346 ( Error message when you try to add or remove a program on a computer that is running Windows XP or Windows Server 2003: "The Windows Installer service could not be accessed"

  • i cant install important updates,i keep getting and error message.

  • trying to install important updates but keep getting 643 error code.

  • meu windus esta baixo como devo fazer com que ele aumente

  • Can not install important updates or any other programs....keep getting the error message. Attempted to use the repair options on the Microsoft site, even attempted to repair the registery with what they provided and still hasn't fix the problem. Any solution????

  • When trying the fixit for you file, the message "The Windows Installer service could not be accessed" shows up.

  • In Services (Local), there is no Windows Installer to right click for Properties.

  • I've tried all solution methods and nothing has worked, under method 1: "Click Start, type Services.msc and press {ENTER}" the windows installer is not even listed.  Any help would be appreciated.

  • I have tried all the fixes with no luck.  I do not see the Windows Installer in Services but I do see Windows Modules Installer.  Is this the same thing?  If not how do you get windows installer reinstalled where it shows in Services?  Any help would be appreciated.

  • I have tried 3 of the 4 fixes for this problem and none work. When tried the fix-it method I got the same message. In services (local) windows installer is not listed but windows module installer is. It was stopped so started and still no help. I cannot install updates or any other programs. Cannot not uninstall anything either. Starting to think Apple!

  • For .MSI applications that appear to have trouble installing, the downloadble FIXIT "widget" is a .MSI application that's supposed to fix the .MSI install problems?  Really?!?!

    That's like a troubleshooting a STALLED vehicle--by having the owner DRIVE it around a few miles!!!!  Or, (my personal favorite), "Having INTERNET CONNECTION problems?  Just visit microsoft's web site for technical support!!!"

    Would you, by any chance, have this FIXIT "widget", in a .EXE or .COM or .ZIP format?

  • Using Windows Installer service to Install a program to fix windows installer service?

  • Thanks for this post, i will try that.

  • Trying to install citrix and it gives me this message on Win7. Restarted the service many times. Does not do anything. How to sold this? Please help.

  • Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer and confirm that:

    InstallerLocation points to C:\Windows\system32\

    MsiExecCA32 points to C:\Windows\syswow64\msiexec.exe

    MsiExecCa64 points to C:\Windows\system32\msiexec.exe

    On my machine, both MsiExecCA32 and MsiExecCA64 were pointing to the system32 folder. Once I modified MsiExecCA32 to point to syswow64 and rebooted, the installer worked just fine.

  • Try " Long Path Tool " is also useful in situations where you see these error messages: Cannot read from source file or disk, there has been a sharing violation, cannot delete file or folder, the file name you specified is not valid or too long, the source or destination file may be in use and many other file managing errors that you encounter in your computing use.

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