Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: Recurring unexpected shutdown and BSOD c000021a, Startup Repair

07 Sep 2012   #1
set9676

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 
Recurring unexpected shutdown and BSOD c000021a, Startup Repair

This is my first post, so I apologize in advance for omitting any important information or additional ignorance on my part. I'm far from a computer expert.

My Gateway NV53 had a meltdown in late July (unable to boot, would crash in safe mode, unable to restore, etc.) and I was forced to restore the laptop to factory settings, losing all my files in the process.

It was working fine for about a month until last week it unexpectedly shutdown. On rebooting I got the BSOD Stop: c000021a error. After about 4 tries I finally got the advanced boot menu to load the system/startup repair, which seemed to fix the problem after about 30min or so.

I thought everything was fixed, but I got the same problem yesterday afternoon: suddenly crashes (no BSOD, just shuts down), with the c000021a error on re-start until I run startup repair which fixes the problem.

Any ideas on why this keeps happening? I have read that c000021a is often caused by 3rd party software updates interfering with WinLogon, which compromises the security of the system, but the crashes aren't occurring after downloading anything or installing new software (intentionally, at least). The first crash happened while I was using Skype, the second time while watching a YouTube video.

When I reboot after the startup repair, my Norton Antivirus definitions are out of date and must be updated, and there are always Windows Updates to install upon shutdown. This past time I also had to re-install Chrome. Is this because Norton AV updates or Windows Update is causing the crash, and startup repair is then removing these updates to restore the system?

Windows is currently operating normally, but I'm trying to prevent this crash from continuing to repeat itself. Im getting sick of using startup repair every week. I have also turned off automatic windows updates for the time being.

As a side note, I was planning to purchase some DVDs to make a factory default disc so that I could repair the system if startup repair suddenly stopped working, but how is this any different from simply using the recovery manager in the advanced boot menu to do a full factory recovery? I have also read about using DVDs to create a system image. How is this different, and which method should I be using to be able to recover my laptop if startup repair stops working for me?

Thanks for your suggestions,
Spencer


My System SpecsSystem Spec
.
07 Sep 2012   #2
beret21

Windows 7 Ultimate x64
 
 

DUDE just post the problem .................
LONG STORIES r kindda anoying !

Just the full error that appears on that bsod
My System SpecsSystem Spec
Reply

 Recurring unexpected shutdown and BSOD c000021a, Startup Repair




Thread Tools




Similar help and support threads
Thread Forum
BSOD on Computer Startup after Unexpected Shutdown
Hi, I have recently (just a few days ago) put together a computer using this barebones kit from TigerDirect:AMD A10-5800K 3.8GHz Quad-Core Unlocked APU/Asus A55BM-E mATX MB/4GB DDR3 1600 Patriot Viper Xtreme Memory/500GB Seagate 500GB SATA HDD/2X LED Case Fan/Ultra Xblaster V2 case w/450W PSU...
BSOD Help and Support
MacBook Pro 2011 - Startup Repair BSOD after every Hard Shutdown
I've been working on this for about 4 days now, and I'm officially asking someone else for help. I even dished out $30 for RegCure Pro, hoping that it would fix some magical registry madness that is causing my problem. I've installed a legit "System Builder" copy of Windows 7 Professional on a...
BSOD Help and Support
Unexpected shutdowns with BSOD c000021a on startup
This has happened twice now in the past week. Computer will randomly shutdown unexpectedly (cold and dark) with the BSOD c000021a on startup. I am able to get windows to boot again using startup repair, but I'm getting sick of having unexpected crashes. Any suggestions? Please advise if...
BSOD Help and Support
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...
BSOD Help and Support
Windows 7 Startup Repair error 0x490, hard shutdown problem
Hello fellow users of Windows 7, I am having some real trouble with booting up Windows 7. The other day, I was dealing with a virus (or two, or heck, even more, at least System Security 2012 and Privacy Protection, both rogue spyware), and decided to reboot into safe mode. However, maybe it was...
General Discussion


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 02:44.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App