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Windows 7: Win 7 64-bit BSOD 1a

01 May 2011   #1

Windows 7 Pro 64-bit
Win 7 64-bit BSOD 1a

Win 7 64-bit
This is the first installed OS (formatted HD)
Full retail version
Most hardware is just over a year old
The OS has been recently reinstalled

I have run driver verifier.
I have run memtest ad nauseum.
I have performed scandisks as well.

This appears to occur at the time of weekly system scans from MSE.

Any help is greatly appreciated.


My System SpecsSystem Spec

01 May 2011   #2

Windows 7 Ultimate x86

So far it's all a bit inconclusive.
There were BSODs on 3/26 and on 4/6 that blamed a NVIDEA driver nvlddmkm.sys
Fault bucket X64_0x116_TdrBCR:D_Tdr:2_IMAGE_nvlddmkm.sys, type 0
Event Name: BlueScreen

Which seems to be a pretty recent one
nvlddmkm.sys Thu Apr 07 23:22:12 2011 (4D9E7F64)
You could try a rollback to the former version.
While the one on 4/13 is attributed to MEMORY MANAGEMENT
Fault bucket X64_0x1a_41790_nt!MiDeleteVirtualAddresses+3bdc0, type 0
. You said you ran Memtest lots of times. But did you test each strip separately? If not I would suggest to do that just to be sure. Right now you run without any detected virus protection while UAC is switched off. I understand why you do that but be very careful not to invite those nasties in and cause more harm since they have full admin rights right away. So I would for now run a full scan with
Malwarebytes : Malwarebytes Anti-Malware is a free download that removes viruses and malware from your computer
Sorry I can't give you any better advice ATM

My System SpecsSystem Spec
01 May 2011   #3

Windows 7 Pro 64-bit

Thanks for your response.

I've been toying with the nVidia drivers for a while, and since updating it 4/18 have not had any vid issues. I believe that to be non-related to the current BSOD.

Regarding virus protection, I am running Microsoft Security Essentials and keep up to date with definitions. I stay away from the likely culprits, and run Malwarebytes on a regular basis. Thanks for the recommendations.

Regarding memory, I have not removed either to perform Memtest. I will try this week to remove one at a time and run Memtest, to see if I can find an issue. What would you recommend as a sufficient number of tests per stick?

Thanks again!
My System SpecsSystem Spec

01 May 2011   #4

Windows 7 Ultimate x86

You're very welcome, Yerfdog!

The usual recommendation about Memtest is you should run it for several hours probably overnight but at least 7-8 cycles for each stick. That's to catch those pesky flaws that only show up every so many runs. (Not unlike flipping bits on a hard drive)
BTW did you ever play with the RAM Timing/Voltage in BIOS ? That could cause the same effect. If the refresh cycles are too long or the voltage is set too low, bits might get dropped depending on other (unrelated) tasks that the computer performs at that time.
On a side note: I wonder why MSE isn't recognized by your computer as a sufficient antivirus.
Maybe it's a borked installation. You could try an uninstall/reinstall as outlined here
How to manually uninstall Microsoft Security Essentials if you cannot uninstall it by using the Add or Remove Programs item
My System SpecsSystem Spec
01 May 2011   #5

Windows 7 Pro 64-bit


I wondered the same thing about MSE. I'll do the unin/rein later. Thanks for the link.

I haven't played with RAM timing or voltage in BIOS in quite a long time. Perhaps I should check that out. I think perhaps MEMTEST on indi sticks should go down first, though. What would you recommend for RAM settings, or where can I find that info?

Again, thanks!
My System SpecsSystem Spec
01 May 2011   #6

Windows 7 Pro 64-bit

MSE uninstalled and reinstalled. Updating defs now, Windows now recognizes it as an antivirus. That was odd, indeed.
My System SpecsSystem Spec
01 May 2011   #7

Windows 7 Ultimate x86

GOOD that's one problem out of the way

Those informations you 'll typically get on the manufacturer's website.
If you can't figure out your specific RAM you could try
Buy SIW Pro or Download SIW Freeware
or the crucial System Scanner from here
Use the Crucial System Scanner software to find out what type of memory is in your computer
and then look up the manufacturer's recommendations.
My System SpecsSystem Spec
01 May 2011   #8

Windows 7 Pro 64-bit

Thanks. I've got that much in my system info posted in the forums:

OCZ 30B1600LV2G.

I'll check their rec's later.
My System SpecsSystem Spec

 Win 7 64-bit BSOD 1a

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