Windows 8.1 Update Crippling PCs With BSOD, Microsoft Suggests You Roll Back
MojoKid writes Right on schedule, Microsoft rolled-out an onslaught of patches for its "Patch Tuesday" last week, and despite the fact that it wasn't the true "Update 2" for Windows 8.1 many of us were hoping for, updates are generally worth snatching up. Since the patch rollout, it's been discovered that four individual updates are causing random BSoD issues for its users, with KB2982791, a kernel-mode related driver, being the biggest culprit. Because of the bug's severity, Microsoft is recommending that anyone who updated go and uninstall a couple of the specific updates, or rollback using Windows Restore. You can uninstall these updates in much the same way you uninstall any app; the difference is that once you're in the "Programs and Features" section, you'll need to click on "View installed updates" on the left. While it's mostly recommended that you uninstall 2982791, you may wish to uninstall the others as well, just in case.
I'm using Windows 7 and I was affected by this. I can't fathom the depths of ineptitude required to release such an update, to be perfectly honest.
Here is the better workaround for the problem from Microsoft: https://support.microsoft.com/kb/2982791
I hadn't realised it was an update which caused the error, so when I finally resorted to system restore it just auto-updated immediately and broke again. At which point a second System Restore decided it would fail to modify a file and thus refused to work. Four hours later, I had to format to get Windows back.
One thing I learned: Disable fast boot, if it's enabled, on your Windows machine (powercfg -h off will disable hibernation entirely). Apparently a Ubuntu boot dvd cannot mount an NTFS partition with write enabled if a hiberfile.sys is present (apparently windows leaves its mounts active and stored in said file, so modifying the file system would cause problems). You can mount it as read-only and get your data, but if you run into a problem that could be fixed by modifying or deleting files then you're out of luck if fast boot is enabled and the action required cannot be performed from the windows boot environment (you can't disable fast boot from it, the required services aren't loaded).
Your startup time will be a little slower, but you might just save that time if something ever goes wrong with your Windows install and system restore fails.