Warning - KB3004394 corrupts system files

whs · Dec 10, 2014

In today's set of Windows 7 updates there is the above KB that corrupts system files - at least in my system. I immediately noticed that my Magnifier .exe was dead and it also mucked around with my Rocket Dock. When you run the updates, you better deselect or hide that one.

fireberd · Dec 10, 2014

I did the updates today, fortunately that one failed during the update installs.

whs · Dec 10, 2014

You were the lucky one, LOL

Pauly · Dec 10, 2014

My system took all updates and is functioning properly but fails sfc scans now, lets hope MS release a fix sometime soon

whs · Dec 10, 2014

Pauly, can you please check whether the magnifier works.

whs · Dec 10, 2014

Here is a lot more detailed information

Update KB3004394 breaks Root Certificate in Windows 7/ Windows Server 2008 R2 | Born's Tech and Windows World

shadow2201 · Dec 10, 2014

I can confirm I've done the update, and my magnifier doesn't work. Maybe one I'll have to uninstall if I find any more problems.

Wordsworth · Dec 10, 2014

No problems here. The synergy of even a single computer can be troublesome. Last week I had a problem with Malwarebytes Anti-Exploit not allowing an MS Office program to open. The folks at Malwarebytes could not duplicate the specific problem on my box, though the latest release solved the problem for others that had the MS Office problem. So they asked for help debugging through my box. One computer in who knows how many.

Hope MS fixes the bugs for those that have them because of this update.

Lady Fitzgerald · Dec 10, 2014

This is why I don't install M$ updates until Saturday morning.

Pauly · Dec 10, 2014

whs said:
Pauly, can you please check whether the magnifier works.

No my magnifier doesn't work and if I try to load it my start menu freezes and all buttons are unclickable until a reboot

robinb9 · Dec 10, 2014

here is another issue. and this for windows 8 and 7. I installed the kb on windows 8, no issues. Then I went to update Office 2013 and it came back saying there are network issues. NOT!. I uninstalled the kb on my windows 8 pro desktop and laptop. Now Office 2013 updates on both machines.

So it is effecting Windows 8 also for those who have office 2013 or Office 365
It is staying hidden on both till this is fixed

whs · Dec 10, 2014

More details are coming in on other forums:

Windows Update KB3004394 triggers error messages - News

Urthboundmisfit · Dec 10, 2014

2 more threads here:
http://www.sevenforums.com/performa...fter-windows-update-never-had-any-before.html
http://www.sevenforums.com/general-discussion/354776-windows-diagnostic-tool-error-0x800706f7.html

Discussion @ Wincert says KB3004394 prevents further updates from installing starting @ post #305:
Update list GDR pour Windows 7 SP1 x86/x64 (Fr-En-De-Es-It) - 30 novembre 2014 - Page 16 - Windows 7 et 8 - WinCert.net Forums - Page 16

Another relevant post by qm7 @BC: Windows Update KB3004394 triggers error messages - News

VirtualBox Ticket #13677: 4.3.20 crash after today's Windows update (last comment by bird when I checked)

From what I can tell, the KB3004394 update does not install a catalog file on 64-bit windows 7. It does on Windows 8.1 (C:\Windows\system32\CatRoot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_1_for_KB3004394~31bf3856ad364e35~amd64~~6.3.1.0.cat), so VBox works fine there.

The result of the missing .cat file is that VBox (nor SysInternal's SigCheck.exe for that matter) is not able to verify the authenticity of c:\windows\system32\crypt32.dll and wintrust.dll. If we cannot find any valid signature for the files, we have to assume that they have been tampered with and are forced to abort application loading. These two dlls are important for validating other components, so there is absolutely no way we can ignore this.

Until Microsoft fixes the KB3004394 update on Windows 7, the only solution is to revert/uninstall it.

whs · Dec 10, 2014

Until Microsoft fixes the KB3004394 update on Windows 7, the only solution is to revert/uninstall it.

....and to 'hide' it when it shows up next time. Then you will be safe.

robinb9 · Dec 10, 2014

Microsoft just pulled it from the mu servers

The Howling Wolves · Dec 10, 2014

I have always installed Windows updates in increments.
Taking the smaller ones first, if it asks for a reboot I do it, then I pick away at the larger ones. Again if it tells me to reboot I do it.

With the update KB3004394 I right clicked on it and hid it.

With this group of updates and the way I did it all systems are working great with just 2 reboots.
Guess I am one of the lucky ones or my system of doing updates is one good way to handle the updates.IMHO
Dennis

ThisIsMadness91 · Dec 11, 2014

That explains why my magnifier wasn't working after I updated yesterday. I got rid of all the updates yesterday and the problem went away. The Office updates and the malicious software removal tool have been reinstalled, but I left the others uninstalled for the time being. I'll either hide that one and reinstall the rest today, or follow Lady Fitzgerald's example and wait for the weekend to come.

Scottyboy99 · Dec 11, 2014

I already installed this in my machines and don't see any issues. So MS has pulled it since. Should I uninstall despite seeing no problems. Are MS likely to issue a newer replacement KB at some point?

Urthboundmisfit · Dec 11, 2014

Scottyboy99 said:
...So MS has pulled it since. Should I uninstall despite seeing no problems...

The fact that M$ has pulled the update (for Win 7 only) indicates there is/are problems/potential problems for all Win 7 users. Even if as you say you "don't see any issues" it doesn't mean they're not there...you may not have encountered a problem yet but I've read in several forums that KB3004394 prevents installation of further M$ Updates = BIG problem!!! I would err on the side of caution and uninstall or use system restore to revert to the point before this update was installed.

YMMV.

Scottyboy99 said:
...Are MS likely to issue a newer replacement KB at some point?

One would assume yes, but even if no the Update is FUBAR. Uninstall it, I say... no need to hide it for now because it won't (or at least shouldn't) be re-offered.

Scottyboy99 · Dec 11, 2014

Ok cheers mate. I will do that

Warning - KB3004394 corrupts system files

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