Definintion update for Windows Defender KB915597



I had this update appear on my computer, and I installed it like many of the
other items that randomly appear on my computer. I am running Vista, this
computer is less than a year old and has always had Vista and several other
programs preinstalled with my purchase.

This update: Definintion update for Windows Defender KB915597 (definition
1.45.430.0) on 10/10/08 is causing huge problems. After the update was
installed I could not get my cable internet to work. I called the internet
provider and worked thru all their things to do and finally they said that my
network card on the computer must be bad. So, I went to the back up and
restore and went a day prior to this update and everything is back to normal,
up and running.

Today, this update installed itself, after I changed my setting to install
the updates manually. So, again after the computer installed this update, and
restarted, no internet. I had to again, go to back up and restore to fix

Any suggestions as to why this update does not work with Vista, and causes a
computer to not use its cable internet provider? Or, how do I uninstall
Windows Defender from my computer? I cannot find it on the list of programs
on my computer under the add/remove program tab.



Hello Cindy,

You might try this.

Go to the main Windows Update window and click on "Installed Updates" (on
the left-hand side of the window, at the bottom), and then remove "Update for
Microsoft Windows (KB931099)" (only).

Reboot. Reboot again. Go back to Windows Update, and re-install the same
update, by clicking on the Check for Updates button.

Other folks may have additional ideas for you; hope this helps a bit, see if
that helps.

I hope this post is helpful.

Let us know how it works ºut.

Good luck


Bill Sanderson

I'd recommend calling Microsoft:

1-866-pcsafety, if you are in the U.S. or Canada.

This is a free call for issues related to security patches, viruses, or

It is possible that there is something else happening here that is causing
the symptom--besides the patch.

Brian M

I recommend you check that you have set your restore options first to allow
restore points so you can back track always.

I read that if defender believes a service is acting suspiciously it will
'disable' it. Sorry cant recall where. I had massive problems about the time
of this update and believe this is related. I found nearly all my services
were disabled -network, http, security centre etc etc thus disabling internet
cable access amoung many other services - even after re-enabling them all
(not preferred) cannot run my security center - time for other support for me!

You can turn Windows Defender off. See Start/Help& Support and search on
'Defender' Item 10 tells you how to turn it off as follows
Turn Windows Defender on or off

When Windows Defender is on, you will be alerted when spyware and other
potentially unwanted software tries to install itself, run on your computer,
or change important Windows settings. If you use the default settings,
Windows Defender will also check for new definitions, regularly scan for
spyware and other potentially unwanted software, and automatically remove any
malicious software that it finds.

Click to open Windows Defender.

Click Tools, and then click Options.

Under Administrator options, select or clear the Use Windows Defender check
box, and then click Save. If you are prompted for an administrator password
or confirmation, type the password or provide confirmation.

And if really stuck and need a bandaid - but not recommended, you can turn
defender off by 'disabling the service' - this of course disables all the
good things it does also.
You can find the defender service and others at Start/administrative
Tools/Computer Management[services&Applications][services] look for 'Windows
Defender' open it and set to 'disabled' and [OK]. reboot.

I know this is more info than help. Use it at your own risk.


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