
After you apply this update, the client computer can receive urgent root certificate updates within 24 hours. Usually, a client computer polls root certificate updates once a week. What does Update KB3004394 do? The Windows Root Certificate Program enables trusted root certificates to be distributed automatically in Windows. Update KB3004394 has been rolled out for Windows 8.1, Windows RT 8.1, Windows Server 2012 R2, Windows 8, Windows RT, Windows Server 2012, Windows 7, and Windows Server 2008 R2. Searching the web, it seems that Update KB3004394 (which is December 2014 update for Windows Root Certificate Program in Windows) is the root cause for all this trouble. Installing Microsoft Security Essentials (MSE) fails with error 8004ff91 (see this MS Answers discussion).The Windows Diagnostic Tool reports error 0x800706F7 and doesn't work anymore(see this entry).
Windows server 2008 security update breaks windows update install#

2014), Windows 7 and Windows Server 2008 R2 shows several errors.

After installing all updates enrolled from December patch day (December 9. I noticed this problem during comments left on my to days German blog article Microsoft Dezember 2014-Patchday-Nachlese.
