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When Windows Update goes wrong


Windows Update is usually a very reliable method of keeping Windows based computers up to date. Rough in the early days, it’s come a long way since then. Smooth and mostly transparent in the background, it isn’t often that bad updates slip through.

Unfortunately, during after August’s Patch Tuesday, such an event occurred. After a number of updates were either automatically approved or approved by myself, we had some computers blue screen and go into a reboot loop. Thankfully, out of almost 180 computers, only 5 have suffered the problem seen below:

WP_20140814_001

All of the affected computers were running Windows 7 x64 SP1 with all updates applied. The first 3 times this happened, I couldn’t find a cure for the problem and ended up wiping and redoing the computer from scratch. Later in the week, I found some instructions online on how to get out of the loop and get back into working order.

  1. Get into the Recovery Console either from install media or by letting the Repair your Computer wizard run after a number of crashes.
  2. Open up a Command Prompt and delete the FNTCACHE.DAT file located in C:\Windows\System32
  3. Reboot the computer, and you should now be able to get back into Windows.
  4. Delete the FNTCACHE.DAT file again, as it will have been recreated by Windows.
  5. Lastly, go to Windows Update in the Control Panel, then view Installed Updates. Remove KB2982791 and optionally KB2970228. The other 2 updates mentioned out there on the web only apply to Windows 8.1/Server 2012 and so are irrelevant to Windows 7 computers.
  6. Reboot after the patches are removed.
  7. As I said, it’s not often anymore that bad updates slip through all of Microsoft’s testing, but it does happen. Although it’s frustrating, I don’t intend to modify how I approve patches. I’d rather take the risk of something like this happening than get hammered by Alureon or Conficker or some other nasty because I ignored security patches.

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