From: AES on
Need (and will appreciate) help with a Security Update glitch I seem to
be caught in. Should I or should I not try to install a
"SecUpd2009-005Intell.pkg" package which keeps re-appearing on my
desktop at random intervals, like a day or two apart.

Details:

A while back I posted about prolonged Finder hang-ups I was
experiencing, especially (at least it seemed to me) when doing Save or
Save As commands from various apps on my 2007-vintage MacBook with OS
10.4.11. When one of these happens, a spinning beach ball appears and
can remain for as much as several minutes.

So far, however, it's _always_ eventually gone away and everything has
then apparently been all OK. Punching the Force Quit key combination
during the spin sometimes brings up "Finder Not Responding -- Relaunch?"
at the bottom of the Force Quit window.

I don't think this is a HD problem, as one earlier responder suggested:
there are no odd clicking or other hard disk sounds; Disk Utility says
everything is fine; and I don't encounter any other problems in my
fairly intensive use of the system.

Today this happened, at a time when there was enough uncovered area on
my desktop that I happened to note an unexpected volume in one of the
open areas: the kind of external disk icon that appears when you open a
..dmg file, with volume name "Security Update 2009-005". Opening it
showed a package

"SecUpd2009-005Intell.pkg"

which Get Info said was an Installer package, v1.0, 172.8 MB -- and
which I now recall seeing once or twice before.

I usually click OK on and install any Software Updates that Apple offers
to send down to me, but I was leery of going ahead with this one because
of its several month old date; and also because Software Update (in the
Apple Menu) says my software is up to date. So I closed it, and then
did an EasyFind search for "SecUpd" which brought up a chronological
list of about 120 lines of sequential SecUpd files dating back to 2006.
The last dozen lines of this file, covering SecUpd2009-004 and
SecUpd2009-005 can be viewed in

<http://www.stanford.edu/~siegman/Picture1.pdf>

(Sorry, I don't know how to capture these lines into a text file.)

Should I just go ahead and install this thing (assuming I can get it
back on my desktop?; I don't see the parent .dmg file anywhere), or is
there something suspicious about this?

Thanks for any advice.