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Windows 7: BSOD on startup c000021a {fatal system error}

14 Jun 2012   #1

Windows 7 x64 SP1
BSOD on startup c000021a {fatal system error}

Hey fellas,

i restarted my compure about an hour ago for it to complete a windows update, on the logout screen and showed: installing updates, it jumped from 10% to 20 and thirty
and the skipped to shutting down.
when starting back up again i got a BSOD saying:

STOP: c000021a {fatal system error}
The Verification of a knownDLL failed. system process terminated unexpectedly
the system has been shut down.

in the startup repair i get:
startup repair cannot repair this computer automaitcally.

Problem Signature:
Problem event name : StartupRepairOffline
Problem signature01 : 6.1.7600.16385
Problem signature02 : 6.1.7600.16385
Problem signature03 : unkowen
Problem signature04 : 21200194
Problem signature05 : AutoFailover
Problem signature06 : 2
Problem signature07 : NoRootCause
OS version: 6.1.7601.
Local ID: 1033

my parts are:
i7 2600k @3.4
asus p8z68 v pro / gen3
g.skill ripjaws x 8GB
corsair 750TX
OCZ Vertex 3 120GB

for some reason i cant find how to enter safe mode on this mobo (its a new computer)
ive hit F8 and it just takes me to a boot priority. F10 11 12 arnt for safe mode either.
ive googled and read around a bit but don't fully understand what this is and how to fix it, i would very much appreciate the help.

My System SpecsSystem Spec
15 Jun 2012   #2
Microsoft MVP


As I recall on an Asus mobo, you've gotta hit F8 at just the right moment (immediately before the Windows splash screen shows up). Hitting it too early will dump you into the boot device menu popup.

Safe Mode is the key here. If unable to get into Safe Mode, then there's not a whole bunch that we can do.
The "fix' will be finding the missing DLL and replacing it (to see if that's the only problem).

Also, please try the free, bootable diagnostics here: Initial Hardware Diagnostics
Especially try the hard drive and malware procedures.

Once in Safe Mode, please provide the info from here:
My System SpecsSystem Spec

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