The Windows Installer Service could not be accessed. This can occur if you are running Windows in safe mode, or if the Windows Installer is not correctly installed. Contact your support personnel for assistance.

At step 9, receive an error:

The service is not responding to the control function.

More help is available by typing NET HELPMSG 2186.

And if you have a problem with windows installer, which I doubt. Try this.

Determine the Version Of Windows Installer

Windows Vista comes with version 4. Version 4.5 is available as a download. To determine the version,

Click Start - All Programs - Accessories - Right click Command Prompt and choose Run As Administrator. Type

msiexec

If you have Version 4.5 try reinstalling it from

http://www.microsoft.com/en-au/download/details.aspx?id=8483

If you have Version 4 continue with the other steps below.

Reregister Windows Installer

This will reregister Windows Installer.

Click Start - All Programs - Accessories - Right click Command Prompt and choose Run As Administrator. Type

regsvr32 c:\Windows\System32\msi.dllregsvr32 c:\Windows\System32\msihnd.dllregsvr32 c:\Windows\System32\msimtf.dllregsvr32 c:\Windows\System32\msisip.dll

msiexec /reg

Fixit

Microsoft have a range of automatic programs to fix common problems. For Windows Installer problems see

http://support.microsoft.com/mats/Program_Install_and_Uninstall/en-us

For the full list visit

http://support.microsoft.com/fixit/en-us

When you choose to download it, choose the option to run on another computer. Then you can save it to your harddisk in a folder. Open the folder, open the folder Fix it Portable, and run Launch Fix It. It will contain all 27 Fixits.

How To Use Fixit

Start Fix problems that programs cannot be installed or uninstalled.

Next you'll be asked Install or Uninstall.

If Installing and you have previously installed or attempted to install try uninstalling first.

Next you will get a list. Choose from that list.

Reinstall the Services Registry Entries

Download MsiServer_Vista_32.reg from https://skydrive.live.com/redir?resid=E2F0CE17A268A4FA!121

Click Start - All Programs - Accessories - Right click Command Promptand choose Run As Administrator. Type Regedit and File menu - Import and import MsiServer_Vista_32.reg.

Reboot

Restart the Service and it's Dependent Services

Click Start - All Programs - Accessories - Right click Command Promptand choose Run As Administrator.

sc start DCOMLaunch

sc start RpcSs

sc config msiserver start= demand

sc start msiserver

Turn Installation Logging On

"C:\Windows\system32\msiexec.exe"  -I "C:\Users\David Candy\AppData\Local\Temp\IPDT_Install.msi"

Is the command line to install a particular product. Use Task Manager to find your command line. By running the setup program and looking in Task Manager for the msiexec program's command line that the setup program started.

This will also find the command line.

Click Start - All Programs - Accessories - Right click Command Promptand choose Run As Administrator.

wmic process where (name='msiexec.exe') get commandline /format:list|findstr /i /c:" -i "

Then change it to add logging. Add this to the command line -lvx "%userprofile%\desktop\install.log"

"%systemroot%\msiexec.exe"  -lvx "%userprofile%\desktop\install.log" -I "%temp%\IPDT_Install.msi"

The log file is saved to your desktop.

Hello elaynedurham, welcome.

Try resetting the DLL files associated with the Windows Installer Service:

RESTART WINDOWS INSTALLER SERVICE

1. Click START
2. Type 'cmd' (without quotes). Right click the result (there should only be one)

and select 'Run as Administrator'

** Close out of any open programs before moving to the following steps

3. In command prompt, type 'msiexec /unregister' (without quotes and with a space between msiexec and /unregister)
4. Press enter
5. Type 'msiexec /regserver' (without quotes and with a space between msiexec and /regserver)
6. Press enter
7. Type 'net stop msiserver' (without quotes and with spaces between net and stop {and} stop and msiserver)
8. Press enter
9. Type 'net start msiserver' (without quotes and with spaces between net and start {and} stop and msiserver)

If that does not work, as an alternative that has worked in the past, try downloading a previous version.

http://www.filehippo.com/download_itunes_32/2919/

Let us know what happens,

Thanks!

Windows Installer IS NOT TURNED ON in safe mode.

You can try turning it on by starting it in safe mode.

Not that that will help you any.

You have to run elevated to have admministrative privliges. You do that by right clicking whatever program you are using and choosing Run As Administrator.

To fix ITunes problems you have to uninstall all apple programs in Programs And Features. ITunes installs lots of other programs, but only uninstalls itself, not all the other programs it installed. Then Reinstall ITunes.

I tried downloading the latest version of Itunes and I get an error message that I'm missing a dll file; so then I tried to remove; first it said that the administrator had set policies to forbid this installation, but then it said that I did not have the authority to remove and to contact the systems administrator.  However, I am signed in as the systems administrator. 

Then I tried to remove the program in safe mode and it told me that the Windows installer could not be accessed; so then I went back into regular mode and following the instructions above and stopped and restarted it.  Then I went back into safe mode to try to remove the program but I still got the same error message that the Windows installer could not be accessed.  I can't download an earlier version because it says a later version is already installed. 

First I don't understand why I can remove a program if I am signed in as the administrator; and secondly I don't know how I can repair my Windows installer; I get all the automatic updates and don't seem to have any problems with downloading and installing other programs.