That update that Microsoft offered a few days ago, came to affect users of both Windows 7 and Windows 8.1, appearing in the first case a black screen and in the other, the typical blue screen "of death", elements that did not allow the operating system to start completely.
If you had this defect (or a friend of yours suffered from it) we recommend that you read a short guide that will help you correct the problem in Windows 8.1; It could also be used for the other version of the operating system that was affected, although this may not be necessary (referring to Windows 7) because a few patches have recently been posted on the web security that should theoretically fix the problem.
Security patches for Windows 7 / 8.1 32-bit and 64-bit
The security patches that have been proposed on the web would theoretically revoke KB2982791, which is responsible for causing the black screen; the new patch now has the id of KB2993651, which would replace the previous one. In a few computers with Windows 7 the black screen did not appear, although some problems arose for certain applications, one of them being Adobe Photoshop Elements according to certain comments from its users.
- Security update for Windows 7 32-bit: KB2993651
- Security update for Windows 7 64-bit: KB2993651
- Security update for Windows 8.1 32-bit: KB2993651
- Security update for Windows 8.1 64-bit: KB2993651
Those who have tested these patches have responded in different forums about the solution of the problem in Windows 7, there being no reports on their effectiveness for Windows 8.1, although you can get to test each of them if your operating system problems are already found. Now, if you cannot log in, we recommend that you try to do it in "safe mode" so that you apply each of these patches.