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Windows 7: Continuous BSOD "IRQL Not Less Than or Equal"

07 Oct 2011   #1

Windows 7 x64
Continuous BSOD "IRQL Not Less Than or Equal"

It's a build up pc.
Original OS: Windows 7 32-bit
Current OS: Windows 7 64-bit
8Gb ram
Age of system: Less than a week.

The pc was running windows 7 32-bit just for 1 day, but since it has 8Gb ram I installed Windows 7 64-bit.

The BSOD did not happen at least when 32-bit system was running.

I'm suspicious that the first time I got this BSOD was just after installing AVG antivirus, but I'm not really sure, I can't remember.

The BSOD occurs randomly while doing anything like web browsing, messenger, playing music, etc. It happens to 45 minutes to 3 hours.

I've updated all drivers and downloaded and installed Service pack 1.

After BSOD pc restarts and this message comes up:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.
Locale ID: 2057

Additional information about the problem:
BCCode: a
BCP2: 0000000000000002
BCP3: 0000000000000001
BCP4: FFFFF80002A91841
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1

Files that help describe the problem:

Read our privacy statement online:
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Dump files and health report attached.

Thanks for your help and excuse my poor english.

My System SpecsSystem Spec
07 Oct 2011   #2

Win 7 Ultimate 64-bit. SP1.


* Please remove any CD visualization programs such as Daemon Tools and Alcohol 120%.

They use a driver, found in your dmp, called sptd.sys, that is notorious for causing BSODs.

Use this SPTD uninstaller DuplexSecure - Downloads
DuplexSecure - FAQ

when you're done you can use this Freeware MagicISO Virtual CD/DVD-ROM(MagicDisc) in its place.

* Second AVG.

I suggest you remove and replace with Microsoft Security Essentials at least to test.

Download tools and utilities | AVG Worldwide



AVG Removal Tool

Virus, Spyware & Malware Protection | Microsoft Security Essentials
My System SpecsSystem Spec
08 Oct 2011   #3

Windows 7 x64

Thank you so much.
I will do everything as you said, I hope it gets solved by doing this.
I'll write back to report any development.
My System SpecsSystem Spec

08 Oct 2011   #4

Win 7 Ultimate 64-bit. SP1.

OK please let us know how you go...
Best of luck! :)
My System SpecsSystem Spec
08 Oct 2011   #5

Windows 7 x64

Well, I've uninstalled Alcohol using SPTD uninstaller DuplexSecure and remove AVG anti virus with one of the advised tools, but yet, another BSOD.

Latest dump file attached.
My System SpecsSystem Spec
09 Oct 2011   #6

Win 7 Ultimate 64-bit. SP1.

This particular crash was related to memory management (probably your dxgmms1.sys directX driver)
I suggest re-installing directX

Download Details - Microsoft Download Center - DirectX End-User Runtime

Also I wondered if you are running a virtual machine as there are indicators that point to it.

Since memory management and a driver are indicated you could also run the following two tests.


*Download a copy of Memtest86 and burn the ISO to a CD using Iso Recorder or another ISO burning program. Memtest86+ - Advanced Memory Diagnostic Tool

*Boot from the CD, and leave it running for at least 5 or 6 passes.

Just remember, any time Memtest reports errors, it can be either bad RAM or a bad motherboard slot.

Test the sticks individually, and if you find a good one, test it in all slots.

RAM - Test with Memtest86+

2-Driver verifier

I'd suggest that you first backup your data and then make sure you've got access to another computer so you can contact us if problems arise. Then make a System Restore point (so you can restore the system using the Vista/Win7 Startup Repair feature).

In Windows 7 you can make a Startup Repair disk by going to Start....All Programs...Maintenance...Create a System Repair Disc - with Windows Vista you'll have to use your installation disk or the "Repair your computer" option at the top of the Safe Mode menu .

Then, here's the procedure:
- Go to Start and type in "verifier" (without the quotes) and press Enter
- Select "Create custom settings (for code developers)" and click "Next"
- Select "Select individual settings from a full list" and click "Next"
- Select everything EXCEPT FOR "Low Resource Simulation" and click "Next"
- Select "Select driver names from a list" and click "Next"
Then select all drivers NOT provided by Microsoft and click "Next"
- Select "Finish" on the next page.

Reboot the system and wait for it to crash to the Blue Screen. Continue to use your system normally, and if you know what causes the crash, do that repeatedly. The objective here is to get the system to crash because Driver Verifier is stressing the drivers out. If it doesn't crash for you, then let it run for at least 36 hours of continuous operation (an estimate on my part).

If you can't get into Windows because it crashes too soon, try it in Safe Mode.
If you can't get into Safe Mode, try using System Restore from your installation DVD to set the system back to the previous restore point that you created.
Driver Verifier - Enable and Disable

I gather your computer PARTS are under warranty.
They should not be presenting with the problems you have listed - & we volunteers should not be putting at risk the rights,YOU, the consumer has under that warranty...
I strongly suggest that you should seek further advice.
Under Warranty terms a duty of care applies.

My System SpecsSystem Spec
09 Oct 2011   #7

Windows 7 x64

Ok, I'm familiar with memtest, I'll do it this night.

And I'll reinstall Directx.

I don't think there's nothing wrong with the hardware, I think it's all system related.

So, you're telling me this last crash was a different thing from the previous BSOD?

After all, the system is running fluently after I removed Alcohol 120% and AVG antivirus, today I just got this BSOD when exiting from a game.
My System SpecsSystem Spec

 Continuous BSOD "IRQL Not Less Than or Equal"

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