Thanks for the heads up, exocet_cm.
It mentions fonts outside the default directory, but it appears to update the following files:
Gdi32.dll 6.3.9600.17246 1,336,624 07-Aug-2014 02:12 x64
Win32k.ptxml Not Applicable 4,213 22-Aug-2013 06:44 Not Applicable
Win32k.sys 6.3.9600.17250 4,148,224 06-Aug-2014 22:39 x64
Gdi32.dll 6.3.9600.17246 1,064,448 02-Aug-2014 03:56 x86
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Possible solution on MS forum (http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_update/blue-screen-stop-0x50-after-applying-update/6da4d264-02d8-458e-89e2-a78fe68766fd):
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Hello,
I had the same problem on two computers, both win7 64bits.
I could solve it by booting from a DVD and removing the following file:
c:\Windows\System32\FNTCACHE.DAT
For sake of completeness, I first removed the files
c:\Windows\ServiceProfiles\LocalService\AppData\Local\FontCache3.0.0.0.dat
c:\Windows\ServiceProfiles\LocalService\AppData\Local\FontCache-System.dat
But that didn't solve the problem. Then I removed the file I mentioned first. So, in the end all 3 files were removed, but I guess the first one is the culprit.
Wow64_win32k.ptxml Not Applicable 4,213 21-Aug-2013 23:39 Not Applicable
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Found via: http://www.infoworld.com/t/microsoft-windows/blue-screen-stop-0x050-error-reported-systems-installing-kb2976897-kb2982791-and-k b2970228-248363