KB3004394 wasn't released for Vista. I think you just have a coincidence in issues of patching.
Windows update KB3004394 issues
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Anonymous
Windows update KB3004394 causes the following issues on my Windows 7 x64 Ultimate system:
All MMC functions (Event Viewer, etc.) now require Administrator action, although in an Administrator account.
Windows Defender service will not start
The Windows Defender Service Terminated with the following error
%%-2147023113
Removing it returns the system to normal.
Anyone else experience this?
Windows for home | Previous Windows versions | Windows update
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274 answers
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Anonymous
2014-12-11T22:55:24+00:00 -
Anonymous
2014-12-11T23:03:44+00:00 I hope MS releases an update to replace the failing KB 3004394, one that includes the good fixes without the bad one that affected Windows Defender. It would be nice if MS put the word out about the status of this during the next update ready to be applied.
Charles Ranheim
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Anonymous
2014-12-11T23:41:17+00:00 unfortunately I am sure. Hopefully MS can fix.
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Anonymous
2014-12-11T23:49:10+00:00 Unfortunately I get the same referral server message and it will not execute
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Anonymous
2014-12-12T00:01:50+00:00 Re: New update KB3024777 fix (after Check for updates about 1 hr ago) - - Since I am administrator on home PC & don't use Defender, I have not seen problem mentioned in other thread.
However, I just installed it & so far it has corrected my onscreen key board issue (re: osk.exe error - "a referral was returned from the server), as well as a 2nd problem trying to access any admin tools (same error message) after trying unsuccessfully to delete KB30004394 from the 12/10 set of updates.
[This had been frustrating as I was not able to access the last restore point earlier due to the inability to execute key Win 32 files from windows/system32/ ...]