You are trying to download Apple iTunes software onto your Microsoft Windows Vista operating system based computer, and you are getting this message, “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”.
Do you need to download a new Microsoft Windows operating system installer you ask? You tried downloading the Apple iTunes software compatible version for Microsoft Windows Vista operating system, but received that very same message. You can try disabling the "User Account Control" service.
You will want to click your Microsoft Windows operating system “Start” menu button, then select “Control Panel”. Now you can type in “UAC”, which stands for user account control into a search box. You will see a link for “Turn User Account Control (UAC) on or off”.
On that next screen you should not check a box for “Use User Account Control (UAC)”, and then click on an OK button. You will need to restart your computer before those changes take effect, but you should not see that message anymore when attempting to install Apple iTunes software.
Once you have Apple iTunes installed successfully, then you can go back and enable "User Account Control" in Microsoft Windows operating system "Control Panel". These instructions were written for a Microsoft Windows Vista operating system based computer. However, you can use them as a basis point for other Microsoft Windows operating systems such as Microsoft Windows seven, eight, ten, and eleven.
If you are still not able to rectify that situation with the inability to install Apple iTunes software on Microsoft Windows operating system you can try performing a Microsoft Windows operating system restore. You will want to choose a restore point back to before Apple iTunes software quit working and you were presented with an error message. Microsoft Windows operating system restore tool will then restore Microsoft Windows operating system back to when Apple iTunes was functioning properly.
The instructions to perform a Microsoft Windows operating system restore will differ depending on what exact version of Microsoft Windows operating system you are using. You can use the Microsoft Windows operating system search tool and type in "System Restore". Then click on and select "System Restore" to open that tool.
You will want to choose a restore point before this problem with Apple iTunes software began. A Microsoft Windows operating system restore can take awhile depending on certain factores. Once that Microsoft Windows operating system restore begins, you will not want to power off, restart, or interfere with that operation.