When you try to install a program which uses Windows Installer in a Windows Vista computer, 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.

This error may occur even though Windows is already in normal mode.

Resolution

Start the Windows Installer service

  1. Click Start, type Services.msc and press {ENTER}
  2. Double-click Windows Installer
  3. Set the Startup type of Windows Installer to Manual
  4. Click Start to start the service. Note down the error message if any.
  5. Click OK.

Windows Installer Registry Fix

If the above steps do not help or if the Windows Installer service is not listed in the Services applet, follow these steps:

  1. Download msiserver.zip and save it to Desktop.
  2. Unzip the file and extract msiserver.reg to the Desktop.
  3. Right-click msiserver.reg and choose Merge.
  4. Click Yes when asked for confirmation.
  5. Restart Windows.

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27 Comments

  1. Nybrat73
    said this on Monday, January 9th 2012 5:33 pm

    I tried both solutions and I am still getting the same error messeage. I haven’t had any problems with anything other than updating and installing the newest version of iTunes.. Do you have any other suggestions?

  2. Bubba
    said this on Tuesday, December 13th 2011 4:39 am

    2nd fix worked like a charm. Thanks

  3. said this on Wednesday, November 2nd 2011 2:28 am

    THANK YOU!!!! I’ve been having a problem for months and bought a program to fix this today but of course it didn’t help. Yours was the correct solution and soooo simple. Thanks.

  4. Paul
    said this on Thursday, October 27th 2011 11:26 am

    The second one worked exceptionally well for me, and that’s after hunting the web for days for a solution. Thank you!

  5. Jorge Jimenez
    said this on Sunday, September 25th 2011 1:19 am

    Thanks!

    I searched a lot of pages and none helped, and your did well and fast.

    You helped me greatly!

  6. jd
    said this on Sunday, September 18th 2011 11:44 am

    Whahoo!!! The second one worked perfectly. I had spent hours following other directions to no avail. Thanks so much! It did just take a minute!

  7. Robert Miller
    said this on Tuesday, August 30th 2011 8:38 pm

    While updating itunes, I received the error message, The windows Installer Service could not be accessed. THis can occur if the Window Installer is not correctly installed.
    I used the windows installer registry fix instructions above, and it worked, thanks a million.

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