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Windows 7: c000021a Fatal System Error

26 Feb 2013   #11
Vir Gnarus

Microsoft Community Contributor Award Recipient

Windows 7 64-bit
 
 

Windows Defender Offline? Be aware that Windows Defender is designed to catch spyware, nothing more. Microsoft Security Essentials is the full malware protection version of Defender.

As for checking for HDD failures, beyond the Crystaldiskinfo, you can try doing some Seatool tests. Do the SMART Test (if available), Short DST, and Short Generic tests. Short Generic and Short DST should only take around 1-5 minutes. If they run a good bit longer than that, then you have a mechanical failure, most likely a head or drive motor failure. If the tests fail, well, you know what that means. Understand this is not a 100% guarantee that it'll detect a bad drive. If the test fails, the drive (or at least some part of the disk I/O process) is bad, but if the tests pass, that doesn't mean the drive gets the green light. Only sure way of testing a drive is to swap it with a reliable one and test system stability on that.


My System SpecsSystem Spec
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26 Feb 2013   #12
Arc

Microsoft Community Contributor Award Recipient

Microsoft Windows 10 Pro Insider Preview 64-bit
 
 

Vir, Windows Defender, the spyware protector and Windows Defender Offline .... are not they two totally different things?
My System SpecsSystem Spec
26 Feb 2013   #13
Vir Gnarus

Microsoft Community Contributor Award Recipient

Windows 7 64-bit
 
 

Hmm, I guess it is. I always thought it was just a standalone version of Windows Defender. Thanks, Arc.
My System SpecsSystem Spec
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26 Feb 2013   #14
Arc

Microsoft Community Contributor Award Recipient

Microsoft Windows 10 Pro Insider Preview 64-bit
 
 

Quote   Quote: Originally Posted by Vir Gnarus View Post
Hmm, I guess it is. I always thought it was just a standalone version of Windows Defender. Thanks, Arc.
Clarifying my thoughts to you .... I am behind a BIOS/boot virus in this case, one of the cause is the OPs statement here:
Quote   Quote: Originally Posted by sp33dyk View Post
Also, forgot to mention that System Repair screen also takes a lot of time to load; i thought it was the DVD, but USB was also slow.

And is there any chance of my HDD being at fault?
So it is not only the HDD, but the other things are also slow there. As TDSSKiller scans from within windows, I suggested WDO here, which scans out of windows, and scans in total.

If my understanding of the issue is wrong, and you rectify me, I will be really happy; as I always get real time coaching from you, my teacher
My System SpecsSystem Spec
26 Feb 2013   #15
sp33dyk

Windows 7 Ultimate x64
 
 

Well, I tried this thing, but sadly it isn't working too.

I tried booting with USB and it was stuck (for about 10 mins) at a loading kinda screen where I could read "Windows Defender Offline" and there was a progress bar, that looked absolutely fine, lol.

I gave it time and later it gave an error saying "Windows Defender offline cannot be started. Please contact Support. Error Code: 0x800705b4(if i am not wrong I got this code for USB)
Then i fetched a CD and burned the image; and same thing happened but this time error code was: 0x80016ba.
:O
My System SpecsSystem Spec
26 Feb 2013   #16
Arc

Microsoft Community Contributor Award Recipient

Microsoft Windows 10 Pro Insider Preview 64-bit
 
 

Can you dismantle the computer and re-seat some stuff like the SATA and power ports, RAM modules, the COMS battery, the GPU etc (apparently no need to remove the CPU, and it may cause problem in re-seating if you dont have thermal paste).

Not too sure, but this might be helpful.

I expected that WDO will work there.
My System SpecsSystem Spec
26 Feb 2013   #17
Vir Gnarus

Microsoft Community Contributor Award Recipient

Windows 7 64-bit
 
 

This error code is caused by the service that Windows Defender Offline uses not starting up. I recommend you do the manual fix instructed here. If you get an error when attempting to start the service, inform us. Understand that some malware will attempt to deactivate this service automatically upon detection, so that may be what's causing it.
My System SpecsSystem Spec
26 Feb 2013   #18
sp33dyk

Windows 7 Ultimate x64
 
 

Well, I read your reply; Arc and decided to reboot and reset the BIOS settings. I loaded the Fail Safe settings and guess what? Windows Defender Offline loaded! ..yup I was happy to see something work, cause slow system irritates me like hell.
It started a Quick scan and nothing was detected. I wanted to do a Full Scan but it's 2 AM here and I think i might do that tomorrow.

About the HDD tests, all tests said PASS:
SMART took mere 10 seconds,
Short DST took about 5 mins at first attempt; i wasn't sure about exact time, so i did it again and this time it took less then 2 mins,
Short Generic took less than 2 mins.
I will be taking backups in case if something goes wrong, but please let me know the probability of my HDD being bad. :P

And I tried to run the FixIt and got this:


Also, when I rebooted after WDO scan, I was asked something like if i wish to set SATA to AHCI mode or something... please tell me what shall I select. I don't remember what I had selected, but yes I did search a bit before I selected something. xD
Also, there's something ya need to know; the network connection used to go off randomly (but less often) and I was unable to access my router's page too. And when I ran Troubleshooter, it detected some error and said Default Gateway wasn't set and it's now fixed. Lol, I was posting this and I realized that this error still exists. :|

So my question is: was it the BIOS settings? Or there's something still hiding in there? :P

Thank you very much to both of you for instant replies!

EDIT: While WDO didn't work, I downloaded Avast's rootkit tool and let it update it's definitions. Then I started the quick scan and after ~10 minutes while the scan was ON, I got BSOD. This one was having text through the screen, unlike the ones I got after Starting Windows screen.
My System SpecsSystem Spec
26 Feb 2013   #19
Arc

Microsoft Community Contributor Award Recipient

Microsoft Windows 10 Pro Insider Preview 64-bit
 
 

It must not be the BIOS settings, but something necessarily with the BIOS. In my best assumption, after the BIOS reset, it should work a bit better, at least. And, something else should be playing there, which we are also to find out.

Can you reset the router manually? I gewss there should be a small hole and a pin is to be inserted in it to reset the router. Better you follow the manual, but the process should be something like this.

In my computer, SATA is set to AHCI mode. Probably you can also do it, windows 7 should not face any problem, but XP probably cannot boot at AHCI mode.
My System SpecsSystem Spec
27 Feb 2013   #20
sp33dyk

Windows 7 Ultimate x64
 
 

I've reset the router and so far it appears that the problem is gone. Will reset BIOS soon.
Also, currently I am running MalwareBytes Full scan, and there isn't any heavy process running as of now; just Google Chrome and uTorrent (not faster than 1.5Mbit) and my system freezes for ~5 seconds after every 5 mins or so.
Will be running Windows Defender Offline tonight and reply in here.
My System SpecsSystem Spec
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