MS bugs - Danger! Windows updates break everything on their way!
READ THIS BEFORE USING TOR BROWSER ON WINDOWS!
With the April's 2016 patch Tuesday Microsoft has shown to everybody what grade of software it's going to supply from now on:
KB3147071 - Welcome new "fast-ring"/"pre-beta" quality (see #18171 (moved)), now for production servers ;) Discussion: https://www.dslreports.com/forum/r30702359-MS-patch-installing-old-vulnerable-version-of-ntdll-dll Proof from MS filelist:
x64 Windows 8.1 and Windows Server 2012 R2
File name,File version,File size,Date,Time,Platform,Service branch,
Ntdll.dll,"6.3.9600.18194","1,737,080","13-Jan-2016","21:26","x64","Not applicable",And together with the
KB3146706 - Welcome BSOD 0x0000006B (http://www.windowsnewscenter.com/2016/04/26/is-microsoft-using-security-patch-kb-3146706-to-break-pirate-copies-of/) they present you:
Problem with application hangs due to EMET 5.5 EAF mitigation after Windows 7 April 2016 updates https://social.technet.microsoft.com/Forums/en-US/7a681da9-d1d3-4566-a13d-55af0de0f2a5/problem-with-application-hangs-due-to-emet-55-eaf-mitigation-after-windows-7-april-2016-updates?forum=emet
KB3149090 - can be PITA too (https://www.reddit.com/r/sysadmin/comments/4ewule/windows_32bit_emet_kb3146706_issue/)
KB3145739 - can prevent you from installing all the April's crap until you install it manually.
And even Windows Update can daunt you to stop installing April's crap by going to very long several days checking for it with full CPU load... (can be fixed as the previous item)
Hangs and crashes of Tor Browser that are probably related to this crap are listed in comments: