This article provides the information on "Microsoft update KB 2982791 has been replaced with KB2993651 for 0x00000050 black screen issue".
Windows update KB2982791 0x50 black screen issues
Many Dell system users reported their systems were receiving black screen errors STOP:0x00000050 (0x50) after the installation of Microsoft Windows update KB2982791.
This issue affected systems with the Windows 7 and Windows 8.x operating systems. Two lesser errors regarding fonts have also been reported to result after installing this service pack.
Microsoft quickly acted to stop deployment of KB2982791 and to research a resolution.
Click the link below for resolution