Q: Bluescreen stop error 0x0000001A (0x00000404,0xC0040690,0x6E595847,0xC0042790)

Original Title: ERROR STOP: 0*0000001A(0*00000404,0*C0040690,0*6E595847,0*C0042790)

I have a bluescreen problem. I have this errors almost in every week. My previous system was Windows Vista( I had the same problem more frequently) and upgraded to Windows 7 Pro. Anyhelp with this subject



Hi orca66,


Mostly likely cause of this issue is defective or mismatched RAM (Random Access Memory). See if the problem exists with combinations as you swap it in and out.


Method 1: Run Memory Diagnostics test to check for any memory problems. Refer the below mentioned link for the same.

Diagnosing memory problems on your computer


Method 2:  Update the chipset, video card, display and network adapter drivers to the latest by visiting the computer manufacturer’s website.

Update a driver for hardware that isn't working properly

Update drivers: recommended links


Refer the below mentioned link for more information.

Resolving stop (blue screen) errors in Windows 7


Hope this helps!


Syed N – Microsoft Support
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References to Vista also apply to Windows 7.

Memory testing methods are in the section following these driver update methods.

This is my generic how to for proper driver updates :

This utility makes it easy to see which versions are loaded :

DriverView - Free - utility displays the list of all device drivers currently loaded on your
system. For each driver in the list, additional useful information is displayed: load address
of the driver, description, version, product name, company that created the driver, and

For Drivers check System Maker as fallbacks and Device Maker's which are the most
current. Control Panel - Device Manager - Display Adapter - write down the make and
complete model of your video adapter - double click - Driver's tab - write down the
version info. Now click UPdate Driver (this may not do anything as MS is far behind
certifying drivers) - then Right Click - Uninstall - REBOOT this will refresh the driver

Repeat that for Network - Network Card (NIC), Wifi, Sound, Mouse and Keyboard if
3rd party with their own software and drivers and any other major device drivers
you have.

Now go to System Maker's site (Dell, HP, Toshiba as examples) (as rollback) and then
Device Maker's site (Realtek, Intel, Nvidia, ATI as examples) and get their latest
versions. (Look for BIOS, Chipset and software updates at System Maker's site while

Download - SAVE - go to where you put them - Right Click - RUN AD ADMIN - REBOOT
after each installation.

Always check in Device Manager - Drivers tab to be sure the version you are installing
actually shows up. This is because some drivers rollback before the latest is installed
(sound drivers particularly do this) so install a driver - reboot - check to be sure it is
installed and repeat as needed.

Repeat at Device Makers - BTW at Device Makers DO NOT RUN THEIR SCANNER -
check manually by model.

Manually look at manufacturer's sites for drivers - and Device Maker's sites.

Installing and updating drivers in 7

If you update drivers manually then it is a good idea to disable Driver Installations in
Windows Updates, this leaves Windows Updates ON however it will not install drivers
which will usually be older and cause issues. If Updates suggests a new driver then
HIDE it (Right Click on it) and then go look for new ones manually if you wish.

How To Disable Automatic Driver Installation In Windows Vista - Drivers


Memory tests do not catch all errors such as mismatched memory (possible even for sticks
that appear to be identical) and when faster memory is placed in system behind slower memory.
So it is best to also swap sticks in and out to check for those even if all memory tests fail to show
a problem.

To test RAM check here - let it run 4+ hours or so.

For the Windows Memory Diagnostic Tool.

Start - type in Search box ->  Memory - find Memory Diagnostics tool at top of list - Right Click -
RUN AS ADMIN follow the instructions

Windows Vista: How to Scan / Test your RAM or Memory with Windows Vista Memory Diagnostic

How to Run the Memory Diagnostics Tool in Windows 7

Test Your Computer’s Memory Using Windows Vista Memory Diagnostic Tool

Hope these help.

Rob Brown - MS MVP - Windows Desktop Experience : Bicycle - Mark Twain said it right.
Rob Brown - Microsoft MVP - Windows and Devices for IT 2010 - current
Windows Insider MVP 2016 - current

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Views: 182,617 Last updated: July 22, 2018 Applies to: