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Error message "The Windows Installer Service could not be accessed".

Error message "The Windows Installer Service could not be accessed".

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One day, I tried to install Adobe Acrobat 8.0 but failed. I got error message” Windows installer service could not be accessed. This can occur if the Windows Installer is not correctly installed. Contact your support personnel for assistance.”. I also tried install ITunes but get the same error.

I changed Window installer service to active and automatic, and use command “msiexec /regserver”, still no go.

I heard another possible root cause is the presence of wow64 with data set as 1 under the key HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/services/msiserver, change value back to 0 may fix it. But still no go.

Finally, I used the below solution on my Win7, the issue fixed, hope it's helpful for you.
1.    Start Regedit
2.    Delete HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/services/msiserver
3.    Restart computer
4.    Copy this msiserver key from other (Vista or Win7)machine which works fine.
5.    Re-install applications, issue resolved.

  • I had the same issue but thanks to your tips, it works properly now and without any errors anymore.

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  • It is so great that I found your article! I didn't know how to fix this problem but  now I finally know! Thanks a lot for sharing!

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  • It is such a problem for me - I get this message hundreds of times a day, and it is so annoying! Thanks for highlighting the solution, hope it will work for me, as I have Windows 7.

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  • this has been a very big problem for me.. let me try this out

  • Thanks for this post, i will try that.

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