.. It seemed to install
.. but it doesn't appear on my Add/Remove Programs (Show Updated) list.
Eric
Well, there are several ways to go thru it.
I don't know, how useful this update is in relation to CAV and PC slowdowns, because I didn't
have time to check that, but I'm going to do it as soon as I can,
because I have to know: does it work or not.
( thought, may be somebody has solved this issue before me, because CAV is slowing down
my machine, which is not weak at all ).
So, the patch-number is only one: KB887742, and you should be able
to track it in two ways ( at least ):
The most simple way to get it is what you did - look for it in
"installed apps" tool ( see image below ):
( text within the red square: "show installed updates" )

Another way is to take look at
this tool.
This tool is an app, which can track all your updates. Screenshott is shown below.
You can search for any update number, if needed (screenshott below):
Hope, this was useful.
Best regards.
I.L.