Hi there,
Just to add the sxs.dll is causing heap corruption which brings down the csrss.exe process which generates the BSOD WINLOGON_FATAL_ERROR (c000021a)
A Microsoft patch to download fix for broken sxs.dll is also found here:
https://support.microsoft.com/en-us/kb/943232
We are tracking down the manifest file which has the offending text causing the bug to be exposed by our VMware tools too.
Thanks.
Steve