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Windows 7: Repeated Unexpected Shutdown BC Code 124

03 Apr 2012   #11
Microsoft MVP


Find the drivers for the DVD drive.
To do this, open Device Manager, right click on the DVD drive, select Properties, select Drive tab, select Driver details
See if PxHlpa64.sys is listed.

If it is, then we'll have to try disabling it to see if that works.
To do that:
- create another restore point
- open Autoruns (you used it when creating the initial reports)
- search for PxHlpa64.sys - and disable each entry by removing the checkmark from the left hand side of the entry.
- remember which one's you changed, just in case you have to change them back manually.
- reboot and see if that fixes things.
- check Driver Details again (after reboot) to see if PxHlpa64.sys is still listed
- if not, rename it to PxHlpa64.BAD
- if it is, post back and we'll see what else we can do.

My System SpecsSystem Spec
03 Apr 2012   #12

Windows 7 Home Premium 64bit

Ok, I used autoruns to disable PxHlpa64.sys. That has knocked out the DVD drive again, PxHlpa64.sys still listed as a driver.
My System SpecsSystem Spec
03 Apr 2012   #13
Microsoft MVP


We're looking at Roxio, Sonic, Music Match Jukebox, or WinAmp
We're not looking at Nero - it doesn't use it.

At the bottom is (IMO) the most likely fix (the one with the "FixIt")

Here's an excellent article about removing this stuff: Uninstalling all files for Sonic Burning engine? - Winamp Forums
First, search your system for pxsetup.exe.
Then open a elevated (Run as administrator) Command Prompt and type:
the full path to pxsetup\pxsetup.exe /uninstall
See if that removes it.
If not, then follow the rest of the steps in the article

Nifty free tool here for getting more detail: busTRACE Filter Driver Load Order

Another way to remove the driver (actually it's filter entry in the registry):
Made for XP but should work with Win7. Make a system restore point just in case.

Simplest solution:
- set restore point
- rename pxhelp file
- make fixes in autoruns and in registry
- reboot and ensure that there's no CD drive showing
- run the "FixIt" in this KB article: Your CD drive or DVD drive is missing or is not recognized by Windows or other programs
(got it from this post: Upper Lower Filters in XP Registry )
My System SpecsSystem Spec

03 Apr 2012   #14

Windows 7 Home Premium 64bit

Roxio, Sonic, Music Match Jukebox, or WinAmp - no obvious trace (to me) of any related files
Nero - now I can see that clearly, pity it's not the culprit!

I tried looking for pxsetup.exe - no trace

Read the filters article, I can see PxHlpa64 in class lower filters. Details tab in device manager gives no other filters to look at.

I am going to go with the simple solution, just to check I have understood it all:

Set restore point
Rename PxHlpa64.sys as PxHlpa64.BADDisable PxHlpa64.sys in Autorun
Delete any upper or lower filters relating to PxHlpa64 in registry
Use FIXIT tool

If I have misunderstood anything please advise before I go blundering around in the registry....
My System SpecsSystem Spec
03 Apr 2012   #15
Microsoft MVP


That's the purpose of the System Restore point - if you "blunder", then you'll be able to fix it with System Restore! :0)

On second thought, maybe just set restore point, rename to .BAD and then run FixIt
Next try would be to set restore point, rename to .BAD, disable all in Autoruns, then run FixIt
Next try would be set restore point, rename to .BAD, disable all in Autoruns, then go blundering around in the registry, then run FixIt
My System SpecsSystem Spec
05 Apr 2012   #16

Windows 7 Home Premium 64bit

Sorry to be so hesitant about rummaging in the registry, I hate breaking things I can't fix with a set of pliers etc...

I have tried option 1 and so far looks like the DVD drive is restored with the pesky PxHlpa64.sys gone. The FixIt tool actually detected problem with the driver filters for the first time. I am going to test the DVD drive a little more to check that it is working properly and will wait to see if the pc crashes again.

Thanks again for all your help, I really appreciate all the time you have spent on this.
My System SpecsSystem Spec
05 Apr 2012   #17
Microsoft MVP


No problem with being reticent to muck about in the registry.
But, it's OK if you can:
- make a copy (with System Restore)
- and know how to revert back (using System Restore from the System Repair Disk)
My System SpecsSystem Spec

 Repeated Unexpected Shutdown BC Code 124

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