So if you’re updating Windows 7, 8 or 8.1 today, make sure you untick and hide MS14-045, a which is a group of security updates that patch a few vulnerabilities inside Windows to improve multi-language support and/or security. This applies to KB2982791, KB290228, KB2975719 and KB2975331, all updates that appear on Windows 7 as well. Once installed, a large number of users have reported seeing blue screens and occasionally a corrupted installation. In the case of KB2982791, uninstalling it fixes one of the blue screen errors. If you encounter issues with any of the other updates, this may require repairing Windows using a disc or, in some severe cases that I’ve seen online in several forums already, a complete reformat.
Microsoft says they are working on the issue and hope to have an update soon about the situation. In the meantime, it’s probably better to hold off on automatic updates for now.