BSOD when using Opera or Office: Bad_Pool_Header 19

My PC started crashing yesterday for no apparent reason.

It's an Asus N56VZ laptop with a legit Windows 7 copy. Had no issues with it up till now.

No major changes done to the computer lately. Installing programs, got a new keyboard.
I get a BSOD 10-30 seconds after starting Opera or some Office program. It may BSOD on other applications too, but those are the ones I've registered so far. I've got DTools installed, but no images active. Been using DTools with no issues before.

I've ran a memory diagnostics and checkdisk, both finding no errors.

Here is the error info I get when Windows starts up again.

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1044

Additional information about the problem:
BCCode: 19
BCP1: 0000000000000021
BCP2: FFFFF900C2E2D000
BCP3: 0000000000003BD0
BCP4: 0000000000000914
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\020213-7737-02.dmp
C:\Users\Heine\AppData\Local\Temp\WER-21387-0.sysdata.xml

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C:\Windows\system32\en-US\erofflps.txt

The BSOD error:

BAD_POOL_HEADER
STOP: 0x00000019 (0x0000000000000021.0xFFFFF900C2E2D000.0x0000000000003BD0.0x00000000000000914)

See attached diagnostics tool results. I've done the tool guide, so I hope I got it right.
Appreciate any help. :)

Edit: I've gathered that device drivers can be a cause for this. I will go through my devices and update what I can.
Edit2: I've also got issues with the firewall. Unable to start it up. I'm downloading Win7 iso and will probably try a repair.

Please remove Avira AV:

• Avira AntiVir Removal Tool - Download

Microsoft Security Essentials.

Recommended from a strict BSOD perspective, compatibility & stability compared to other antiviruses/internet security software. It is free and lightweight:-

• Microsoft Security Essentials - Free Antivirus for Windows
  
  • Malwarebytes : Malwarebytes Anti-Malware removes malware including viruses, spyware, worms and trojans, plus it protects your computer
    
    • Good and Free system security combination.
    • How to Scan Your Computer With Multiple Antivirus Programs - How-To Geek
    
    
  
  

   Warning

Do not start the free trial of Malware Bytes; remember to deselect that option when prompted.

Run a full scan with both (separately) once downloaded, installed and updated.

Reduce items at start-up. Nothing except anti-virus is required plus improves the time for logging in windows.

• Startup Programs - Change
• Troubleshoot Application Conflicts by Performing a Clean Startup

Follow this:

writhziden said:

If you have an SSD, make sure the following are up to date:

• SSD firmware
• BIOS Version
• Chipset Drivers
• Hard disk controller drivers/SATA drivers
• If you have a Marvell IDE ATA/ATAPI device, make sure the drivers are up to date from the Intel site or Marvell site and not from your motherboard/vendor support site.

Upload a screenshot of your hard disk using CrystalDiskInfo:

• CrystalDiskInfo - Software - Crystal Dew World
• Screenshots and Files - Upload and Post in Seven Forums

Make a hard drive test from the hard drive manufacturers website:

• Hard Drive Diagnostic Procedure

Run Disk Check on your hard disk for file system errors and bad sectors on it:

• Disk Check

Take memtest. Run for 8 passes and test each stick in a know good slot for an additional 6 passes.

• RAM - Test with Memtest86+

The goal is to test all the RAM sticks and all the motherboard slots.

Check your motherboard manual to ensure the RAM sticks are in the recommended motherboard slots. Some motherboards have very specific slots required for the number of RAM sticks installed.

If you get errors, stop the test and continue with the next step.

1. Remove all but one stick of RAM from your computer (this will be RAM stick #1), and run Memtest86 again, for 7 passes.

*Be sure to note the RAM stick, use a piece of tape with a number, and note the motherboard slot.

If this stick passes the test then go to step #3.

2. If RAM stick #1 has errors, repeat the test with RAM stick #2 in the same motherboard slot.

*If RAM stick #2 passes, this indicates that RAM stick #1 may be bad. If you want to be absolutely sure, re-test RAM stick #1 in another known good slot.

*If RAM stick #2 has errors, this indicates another possible bad RAM stick, a possible motherboard slot failure or inadequate settings.

3. Test the next stick of RAM (stick #2) in the next motherboard slot.

*If this RAM stick has errors repeat step #2 using a known good stick if possible, or another stick.

*If this RAM stick has no errors and both sticks failed in slot#1, test RAM stick #1 in this slot.

4. If you find a stick that passes the test, test it in all the other motherboard slots.

If Part 2 testing shows errors, and all tests in Part 3 show errors, you will need to test the RAM sticks in another computer and/or test other RAM in your computer to identify the problem.

In this way, you can identify whether it is a bad stick of RAM, a bad motherboard, or incompatibility between the sticks.

   Information

Errors are sometimes found after 8 passes.

   Tip

Do this test overnight, before going to bed.

If Memtest86+ does not find any errors with ram run Windows Memory Diagnostics for 7-8 passes following its tutorial: Memory Diagnostics Tool