Error updating windows vista service pack 1
If you can’t install i Tunes on your Windows PC, or if you see “error 2” or "Apple Application Support was not found" after you install the software, follow the steps below in order.If you see a different error when trying to launch i Tunes, learn how to fix unexpected quits or launch issues.
If the steps in these articles don't help you fix the issue, you might be able to find a solution through a search of the Microsoft support website.If any of these are not installed, download and manually install them.Then download and try a manual install of SP1, but first uninstall or disable any 3rd party security software that is installed.I wanted to add here, also having a computer with Vista RTM in year 2015...Apparently Microsoft has still not addressed this issue; users that are unlucky enough to have Vista RTM are stuck with it unless they come across a Q/A like this.It is therefore possible that error 0x80190194 is not directly related to the problem.
Microsoft Support advised me that the problem is being worked on and that a KB article will be released in due course. In either case, once Service Pack 1 is installed, Windows Update will offer some additional updates and then Service Pack 2. Note: Microsoft provides free phone support for problems installing service packs.
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Better yet perform both the SP1 and SP2 installs while clean booted. Note that if Windows Update is offering SP1, the prerequisite updates are already installed, but if you're installing it preemptively you need to do the prerequisites by hand.
I'd recommend not installing any 3rd party software (of any sort) until after you've got service pack 2 and all existing updates installed, but if you've got security software present it certainly should be disabled before installing the service packs.
The underlying problem is that the Windows Update self-update mechanism is not working.