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windows 7Sometimes, if you try to install an application (software) on your Windows Operating System (XP, Vista or Windows 7), you could get the following error message “The Windows Installer Service Could Not Be Accessed”. If this is your case I have got a couple of solution which could solve this issue and let you install whatever program you wish! 

First Method

  1. Click Start.
  2. Click Run…
  3. In the Run field, type the following commands and make sure to press Enter after each of them:
  4. cd %windir%\system32
    attrib -r -s -h dllcache
    ren msi.dll msi.old
    ren msiexec.exe msiexec.old
    ren msihnd.dll msihnd.old

  5. Now, Download the latest Windows Installer here: Microsoft Download Center

Second Method

  1. Log in to your Windows Operating system as Adninistrator.
  2. Click Start.
  3. Click Run…
  4. In the Run field, type msiexec.exe /unregister and press Enter.
  5. Now type this new command msiexec /regserver and press Enter. (if you run on a 64 bit system, type this command instead: %windir%\Syswow64\Msiexec /regserver)
  6. Done!

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2 Comments to “How to Fix “The Windows Installer Service Could Not Be Accessed” Error”

  1. Web Talk Says:

    I just checked a forum and I talked with a friend of mine. I fixed step 5. It should work now. Thanks!

  2. Gregg DesElms Says:


    …in the second method, step 5, did you mean:

    msiexec.exe /register

    Just checking.

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