Microsoft urges customers to uninstall 'Blue Screen of Death' update
One of last week's security updates has bricked an unknown number of PCs running Windows 7
See Computerworld article below.
Microsoft on Friday quietly recommended that customers uninstall one of last week's security updates after users reported that it crippled their computers with the infamous "Blue Screen of Death" (BSOD).
Within hours of its release, however, users reported that MS14-045 had generated a Stop 0x50 error on some systems, mostly on Windows 7 PCs running the 64-bit version of the OS.
"Installation went smoothly. After rebooting everything worked fine. But when I shut down my notebook and switched it on a little later it came up with a blue screen with a Stop 0x50 in Win32k.sys. I could not even boot into safe mode as Windows failed to start no matter which mode chose," wrote a user identified as "xformer" to start a now-long thread on Microsoft's support discussion forum.
Link to Microsoft's support discussion forum on this topic.
Blue Screen (Stop 0x50) after applying update KB2982791 to - Microsoft Community
RT
Patching will continue until all computers fail!